Sound waves produce echo primarily due to [C] reflection. When sound travels and encounters a sufficiently large and hard surface, such as a solid wall, mountain, or canyon wall, it reflects off the surface rather than passing through it or bending (refraction and diffraction). The reflection of souRead more
Sound waves produce echo primarily due to [C] reflection. When sound travels and encounters a sufficiently large and hard surface, such as a solid wall, mountain, or canyon wall, it reflects off the surface rather than passing through it or bending (refraction and diffraction).
The reflection of sound waves causes them to bounce back towards the source or in other directions, depending on the angle of incidence and the surface characteristics. If the distance to the reflecting surface is significant enough, the reflected sound waves return to the listener’s ears after a noticeable delay, creating the perceptible phenomenon known as an echo.
Understanding the process of reflection and its role in producing echoes is essential for designing spaces, conducting acoustic measurements, and studying sound propagation in various environments, from natural landscapes to built structures.
The effect of sound in the human ear, known as auditory persistence or the duration of the auditory sensation, lasts for approximately [B] 1/10 second. During this time, the auditory nerves continue to transmit signals to the brain after the sound stimulus has stopped, allowing for the perception ofRead more
The effect of sound in the human ear, known as auditory persistence or the duration of the auditory sensation, lasts for approximately [B] 1/10 second. During this time, the auditory nerves continue to transmit signals to the brain after the sound stimulus has stopped, allowing for the perception of sound even after it has ceased.
This phenomenon is crucial for understanding how humans perceive sound and process auditory information. Options [A] (1/5 second) and [C] (1/20 second) represent shorter durations that do not accurately reflect typical auditory persistence. Option [D] (1/2 second) exceeds the typical duration of auditory persistence, as sound effects are generally perceived for a shorter period in the absence of continuous stimulation.
Understanding auditory persistence helps in fields such as acoustics, psychology, and neurology, where the perception and processing of sound play critical roles in human behavior and communication.
The purpose of covering the walls, ceiling, and floor of a good auditorium with fibrous materials like carpet and glass fiber (option [D]) is to prevent echo by absorbing sound. Echoes occur when sound waves reflect off hard surfaces and bounce back, creating unwanted reverberation that can distortRead more
The purpose of covering the walls, ceiling, and floor of a good auditorium with fibrous materials like carpet and glass fiber (option [D]) is to prevent echo by absorbing sound. Echoes occur when sound waves reflect off hard surfaces and bounce back, creating unwanted reverberation that can distort speech and music.
By using sound-absorbing materials, such as acoustic panels, carpets, and fiberglass insulation, the auditorium reduces reverberation time. This improves the clarity of sound, enhances the music or speech intelligibility, and creates a more comfortable listening environment for the audience.
Additionally, these materials contribute to the overall acoustic design of the auditorium, ensuring that sound reflections are managed effectively. This acoustic treatment is essential in optimizing the auditory experience during concerts, performances, lectures, and other events held in the auditorium. Therefore, the correct answer is [D] to prevent echo by absorbing sound.
To hear an echo clearly, the time interval between the original sound and its reflected echo should be [C] more than 1/10 seconds. This time delay is necessary for the sound waves to travel to a reflecting surface and back, creating a perceptible gap between the original sound and its echo. If the tRead more
To hear an echo clearly, the time interval between the original sound and its reflected echo should be [C] more than 1/10 seconds. This time delay is necessary for the sound waves to travel to a reflecting surface and back, creating a perceptible gap between the original sound and its echo.
If the time interval is less than 1/10 seconds (option [B]), the reflected sound waves return too quickly to be distinguished as an echo. In contrast, a delay of more than 1/10 seconds (option [C]) allows for a noticeable echo effect. This phenomenon is crucial in acoustic environments where echoes contribute to the perceived spaciousness and quality of sound.
Understanding the appropriate time interval for echo perception helps in designing spaces where echoes enhance rather than distort sound clarity, such as concert halls and auditoriums.
The working system of radar is based on [B] reflection of radio waves. Radar operates by transmitting short pulses of radio waves from a radar antenna. These waves travel through the atmosphere until they encounter an object, such as an aircraft or ship. Upon hitting the object, some of the radio waRead more
The working system of radar is based on [B] reflection of radio waves. Radar operates by transmitting short pulses of radio waves from a radar antenna. These waves travel through the atmosphere until they encounter an object, such as an aircraft or ship. Upon hitting the object, some of the radio waves are reflected back towards the radar antenna.
The radar system then analyzes the time it takes for the radio waves to return (to determine distance), as well as any Doppler shift in frequency (to determine speed and direction of the object). This principle of radio wave reflection forms the basis of radar technology, which is crucial for applications in aviation, maritime navigation, weather forecasting, and military surveillance.
Options [A] (refraction of radio waves), [C] (Doppler effect), and [D] (Raman effect) are not directly related to the fundamental operation of radar systems, making [B] reflection of radio waves the correct answer.
To hear a clear echo, there should be a minimum distance between the reflecting plane and the sound source of [B] 17 meters. This distance allows for a distinct time delay between the emission of sound and the reflection off a surface, making the echo audible to the listener. When the sound travelsRead more
To hear a clear echo, there should be a minimum distance between the reflecting plane and the sound source of [B] 17 meters. This distance allows for a distinct time delay between the emission of sound and the reflection off a surface, making the echo audible to the listener.
When the sound travels to a surface and back within a short distance, the reflected sound arrives too quickly to be perceived as an echo. As the distance increases, the time gap between the original sound and its reflection grows, resulting in a more noticeable echo.
Understanding this minimum distance helps in designing spaces for acoustic effects, such as concert halls and outdoor environments, where echoes can enhance or detract from the quality of sound. Therefore, the correct answer for hearing a clear echo is [B] 17 meters.
The cause of echo is primarily [A] reflection of sound. When sound waves encounter a large and hard surface, such as a building, cliff, or canyon wall, they reflect off the surface and return towards the source. If the distance to the reflecting surface is significant enough, the reflected sound reaRead more
The cause of echo is primarily [A] reflection of sound. When sound waves encounter a large and hard surface, such as a building, cliff, or canyon wall, they reflect off the surface and return towards the source. If the distance to the reflecting surface is significant enough, the reflected sound reaches the listener’s ears distinctly after the original sound, creating an echo. The perception of an echo depends on the time delay between the direct sound and its reflection.
Absorption of sound (option [C]) reduces echo by absorbing sound waves rather than reflecting them. Refraction of sound (option [B]) involves the bending of sound waves due to changes in temperature or density gradients, but it does not cause echoes directly. The speed of sound (option [D]) affects the timing of echo perception but is not the direct cause of echo itself. Therefore, reflection of sound (option [A]) is correctly identified as the cause of echo.
The decibel (dB) unit is primarily used for [C] the intensity of sound. It provides a logarithmic scale to measure the loudness or intensity of sound waves. Decibels allow us to quantify sound levels across a wide range, from the faintest audible sounds to extremely loud noises that can cause hearinRead more
The decibel (dB) unit is primarily used for [C] the intensity of sound. It provides a logarithmic scale to measure the loudness or intensity of sound waves. Decibels allow us to quantify sound levels across a wide range, from the faintest audible sounds to extremely loud noises that can cause hearing damage. This unit is crucial in various fields such as acoustics, engineering, and environmental science for assessing and managing noise levels.
Unlike options [A], [B], and [D], which are associated with different physical quantities (speed of light, intensity of heat, and frequency of radio waves, respectively), the decibel specifically denotes sound intensity. It helps describe how sound energy is perceived by the human ear, providing a standardized way to communicate and regulate sound levels in various contexts, from everyday environments to industrial settings and entertainment venues.
While shouting, a person keeps the palm near the mouth primarily because [A] in that position, the sound energy will point in one direction only. By cupping the hand around the mouth, the person creates a makeshift horn or amplifier that directs the sound waves forward. This action helps to concentrRead more
While shouting, a person keeps the palm near the mouth primarily because [A] in that position, the sound energy will point in one direction only. By cupping the hand around the mouth, the person creates a makeshift horn or amplifier that directs the sound waves forward. This action helps to concentrate and focus the sound energy towards the intended target or direction, increasing the intensity and clarity of the shout. It can be particularly useful in noisy environments or over distances where clear communication is necessary. This technique does not change the completeness or tone of the sound (options [B] and [C]), but rather improves the efficiency of projecting the sound waves in a specific direction. Therefore, option [A] correctly describes why people use this method while shouting.
Among the processes listed, [C] Polarization does not occur in both light and sound. Polarization is a property of transverse waves where the oscillations occur in a single plane perpendicular to the direction of wave propagation. Light waves, being transverse electromagnetic waves, can be polarizedRead more
Among the processes listed, [C] Polarization does not occur in both light and sound. Polarization is a property of transverse waves where the oscillations occur in a single plane perpendicular to the direction of wave propagation. Light waves, being transverse electromagnetic waves, can be polarized by filtering out vibrations in specific orientations.
In contrast, sound waves are longitudinal waves, meaning the oscillations are along the direction of propagation. Sound waves do not exhibit polarization because their vibrations occur in a single direction aligned with the wave travel.
Diffraction, reflection, and refraction (options [A], [B], and [D]) occur in both light and sound. Diffraction is the bending of waves around obstacles, reflection is the bouncing back of waves from surfaces, and refraction is the bending of waves as they pass from one medium to another.
Thus, polarization stands out as the process unique to light waves and absent in sound waves, making it the correct answer.
Due to what do sound waves produce echo?
Sound waves produce echo primarily due to [C] reflection. When sound travels and encounters a sufficiently large and hard surface, such as a solid wall, mountain, or canyon wall, it reflects off the surface rather than passing through it or bending (refraction and diffraction). The reflection of souRead more
Sound waves produce echo primarily due to [C] reflection. When sound travels and encounters a sufficiently large and hard surface, such as a solid wall, mountain, or canyon wall, it reflects off the surface rather than passing through it or bending (refraction and diffraction).
The reflection of sound waves causes them to bounce back towards the source or in other directions, depending on the angle of incidence and the surface characteristics. If the distance to the reflecting surface is significant enough, the reflected sound waves return to the listener’s ears after a noticeable delay, creating the perceptible phenomenon known as an echo.
Understanding the process of reflection and its role in producing echoes is essential for designing spaces, conducting acoustic measurements, and studying sound propagation in various environments, from natural landscapes to built structures.
See lessHow long does the effect of sound last in the human ear?
The effect of sound in the human ear, known as auditory persistence or the duration of the auditory sensation, lasts for approximately [B] 1/10 second. During this time, the auditory nerves continue to transmit signals to the brain after the sound stimulus has stopped, allowing for the perception ofRead more
The effect of sound in the human ear, known as auditory persistence or the duration of the auditory sensation, lasts for approximately [B] 1/10 second. During this time, the auditory nerves continue to transmit signals to the brain after the sound stimulus has stopped, allowing for the perception of sound even after it has ceased.
This phenomenon is crucial for understanding how humans perceive sound and process auditory information. Options [A] (1/5 second) and [C] (1/20 second) represent shorter durations that do not accurately reflect typical auditory persistence. Option [D] (1/2 second) exceeds the typical duration of auditory persistence, as sound effects are generally perceived for a shorter period in the absence of continuous stimulation.
Understanding auditory persistence helps in fields such as acoustics, psychology, and neurology, where the perception and processing of sound play critical roles in human behavior and communication.
See lessThe walls, ceiling and floor of a good auditorium are covered with some fibrous material, carpet, glass fiber etc. Its purpose is
The purpose of covering the walls, ceiling, and floor of a good auditorium with fibrous materials like carpet and glass fiber (option [D]) is to prevent echo by absorbing sound. Echoes occur when sound waves reflect off hard surfaces and bounce back, creating unwanted reverberation that can distortRead more
The purpose of covering the walls, ceiling, and floor of a good auditorium with fibrous materials like carpet and glass fiber (option [D]) is to prevent echo by absorbing sound. Echoes occur when sound waves reflect off hard surfaces and bounce back, creating unwanted reverberation that can distort speech and music.
By using sound-absorbing materials, such as acoustic panels, carpets, and fiberglass insulation, the auditorium reduces reverberation time. This improves the clarity of sound, enhances the music or speech intelligibility, and creates a more comfortable listening environment for the audience.
Additionally, these materials contribute to the overall acoustic design of the auditorium, ensuring that sound reflections are managed effectively. This acoustic treatment is essential in optimizing the auditory experience during concerts, performances, lectures, and other events held in the auditorium. Therefore, the correct answer is [D] to prevent echo by absorbing sound.
See lessWhat should be the time interval between the original sound and the echo to hear an echo?
To hear an echo clearly, the time interval between the original sound and its reflected echo should be [C] more than 1/10 seconds. This time delay is necessary for the sound waves to travel to a reflecting surface and back, creating a perceptible gap between the original sound and its echo. If the tRead more
To hear an echo clearly, the time interval between the original sound and its reflected echo should be [C] more than 1/10 seconds. This time delay is necessary for the sound waves to travel to a reflecting surface and back, creating a perceptible gap between the original sound and its echo.
If the time interval is less than 1/10 seconds (option [B]), the reflected sound waves return too quickly to be distinguished as an echo. In contrast, a delay of more than 1/10 seconds (option [C]) allows for a noticeable echo effect. This phenomenon is crucial in acoustic environments where echoes contribute to the perceived spaciousness and quality of sound.
Understanding the appropriate time interval for echo perception helps in designing spaces where echoes enhance rather than distort sound clarity, such as concert halls and auditoriums.
See lessThe working system of radar is based on the following principle
The working system of radar is based on [B] reflection of radio waves. Radar operates by transmitting short pulses of radio waves from a radar antenna. These waves travel through the atmosphere until they encounter an object, such as an aircraft or ship. Upon hitting the object, some of the radio waRead more
The working system of radar is based on [B] reflection of radio waves. Radar operates by transmitting short pulses of radio waves from a radar antenna. These waves travel through the atmosphere until they encounter an object, such as an aircraft or ship. Upon hitting the object, some of the radio waves are reflected back towards the radar antenna.
The radar system then analyzes the time it takes for the radio waves to return (to determine distance), as well as any Doppler shift in frequency (to determine speed and direction of the object). This principle of radio wave reflection forms the basis of radar technology, which is crucial for applications in aviation, maritime navigation, weather forecasting, and military surveillance.
Options [A] (refraction of radio waves), [C] (Doppler effect), and [D] (Raman effect) are not directly related to the fundamental operation of radar systems, making [B] reflection of radio waves the correct answer.
See lessTo hear a clear echo, there should be a minimum distance between the reflecting plane and the sound source
To hear a clear echo, there should be a minimum distance between the reflecting plane and the sound source of [B] 17 meters. This distance allows for a distinct time delay between the emission of sound and the reflection off a surface, making the echo audible to the listener. When the sound travelsRead more
To hear a clear echo, there should be a minimum distance between the reflecting plane and the sound source of [B] 17 meters. This distance allows for a distinct time delay between the emission of sound and the reflection off a surface, making the echo audible to the listener.
When the sound travels to a surface and back within a short distance, the reflected sound arrives too quickly to be perceived as an echo. As the distance increases, the time gap between the original sound and its reflection grows, resulting in a more noticeable echo.
Understanding this minimum distance helps in designing spaces for acoustic effects, such as concert halls and outdoor environments, where echoes can enhance or detract from the quality of sound. Therefore, the correct answer for hearing a clear echo is [B] 17 meters.
See lessThe cause of echo is
The cause of echo is primarily [A] reflection of sound. When sound waves encounter a large and hard surface, such as a building, cliff, or canyon wall, they reflect off the surface and return towards the source. If the distance to the reflecting surface is significant enough, the reflected sound reaRead more
The cause of echo is primarily [A] reflection of sound. When sound waves encounter a large and hard surface, such as a building, cliff, or canyon wall, they reflect off the surface and return towards the source. If the distance to the reflecting surface is significant enough, the reflected sound reaches the listener’s ears distinctly after the original sound, creating an echo. The perception of an echo depends on the time delay between the direct sound and its reflection.
Absorption of sound (option [C]) reduces echo by absorbing sound waves rather than reflecting them. Refraction of sound (option [B]) involves the bending of sound waves due to changes in temperature or density gradients, but it does not cause echoes directly. The speed of sound (option [D]) affects the timing of echo perception but is not the direct cause of echo itself. Therefore, reflection of sound (option [A]) is correctly identified as the cause of echo.
See lessDecibel unit is used for
The decibel (dB) unit is primarily used for [C] the intensity of sound. It provides a logarithmic scale to measure the loudness or intensity of sound waves. Decibels allow us to quantify sound levels across a wide range, from the faintest audible sounds to extremely loud noises that can cause hearinRead more
The decibel (dB) unit is primarily used for [C] the intensity of sound. It provides a logarithmic scale to measure the loudness or intensity of sound waves. Decibels allow us to quantify sound levels across a wide range, from the faintest audible sounds to extremely loud noises that can cause hearing damage. This unit is crucial in various fields such as acoustics, engineering, and environmental science for assessing and managing noise levels.
Unlike options [A], [B], and [D], which are associated with different physical quantities (speed of light, intensity of heat, and frequency of radio waves, respectively), the decibel specifically denotes sound intensity. It helps describe how sound energy is perceived by the human ear, providing a standardized way to communicate and regulate sound levels in various contexts, from everyday environments to industrial settings and entertainment venues.
See lessWhile shouting, a person always keeps the palm near the mouth, because
While shouting, a person keeps the palm near the mouth primarily because [A] in that position, the sound energy will point in one direction only. By cupping the hand around the mouth, the person creates a makeshift horn or amplifier that directs the sound waves forward. This action helps to concentrRead more
While shouting, a person keeps the palm near the mouth primarily because [A] in that position, the sound energy will point in one direction only. By cupping the hand around the mouth, the person creates a makeshift horn or amplifier that directs the sound waves forward. This action helps to concentrate and focus the sound energy towards the intended target or direction, increasing the intensity and clarity of the shout. It can be particularly useful in noisy environments or over distances where clear communication is necessary. This technique does not change the completeness or tone of the sound (options [B] and [C]), but rather improves the efficiency of projecting the sound waves in a specific direction. Therefore, option [A] correctly describes why people use this method while shouting.
See lessWhich process does not occur in both light and sound?
Among the processes listed, [C] Polarization does not occur in both light and sound. Polarization is a property of transverse waves where the oscillations occur in a single plane perpendicular to the direction of wave propagation. Light waves, being transverse electromagnetic waves, can be polarizedRead more
Among the processes listed, [C] Polarization does not occur in both light and sound. Polarization is a property of transverse waves where the oscillations occur in a single plane perpendicular to the direction of wave propagation. Light waves, being transverse electromagnetic waves, can be polarized by filtering out vibrations in specific orientations.
In contrast, sound waves are longitudinal waves, meaning the oscillations are along the direction of propagation. Sound waves do not exhibit polarization because their vibrations occur in a single direction aligned with the wave travel.
Diffraction, reflection, and refraction (options [A], [B], and [D]) occur in both light and sound. Diffraction is the bending of waves around obstacles, reflection is the bouncing back of waves from surfaces, and refraction is the bending of waves as they pass from one medium to another.
Thus, polarization stands out as the process unique to light waves and absent in sound waves, making it the correct answer.
See less