On hearing thunder, a person opens his mouth so that to equalize the air pressure on the eardrum of both the ears (Option [B]). Thunder is often accompanied by a sudden change in atmospheric pressure. By opening the mouth slightly, the person can equalize the pressure inside and outside the ear canaRead more
On hearing thunder, a person opens his mouth so that to equalize the air pressure on the eardrum of both the ears (Option [B]). Thunder is often accompanied by a sudden change in atmospheric pressure. By opening the mouth slightly, the person can equalize the pressure inside and outside the ear canal, reducing discomfort or pain caused by the pressure difference. This action helps prevent the eardrums from being pushed inward or outward abruptly, which can occur during rapid changes in air pressure.
Options [A] and [C] are less likely reasons because fear does not directly relate to opening the mouth, and opening the mouth does not significantly affect sound reception compared to the function of equalizing pressure. Option [D] is incorrect as opening the mouth is not primarily intended to expel air. Therefore, among the options provided, equalizing the air pressure on both eardrums is the most plausible reason for opening the mouth upon hearing thunder.
The instrument used to detect submerged objects is called "Sonar" (Option [B]). Sonar stands for Sound Navigation and Ranging. It works by emitting sound waves into water and then detecting the echoes reflected back from underwater objects, such as submarines, ships, or even the seafloor. By measuriRead more
The instrument used to detect submerged objects is called “Sonar” (Option [B]). Sonar stands for Sound Navigation and Ranging. It works by emitting sound waves into water and then detecting the echoes reflected back from underwater objects, such as submarines, ships, or even the seafloor. By measuring the time it takes for the sound waves to return, sonar systems can calculate the distance to these objects and create detailed maps of underwater environments.
Sonar technology is crucial for various applications, including military defense, underwater exploration, navigation, fishing, and marine research. There are different types of sonar systems, such as passive sonar (listening for sounds generated by objects) and active sonar (emitting pulses of sound and analyzing the returning echoes). This technology enables ships to navigate safely through underwater hazards, helps fishermen locate schools of fish, aids in the search and recovery of submerged objects, and supports scientific investigations of oceanography and marine biology.
Options [A] Radar, [C] Quasar, and [D] Pulser are not instruments used for detecting submerged objects, distinguishing them from sonar in underwater detection applications.
The standard sound level for humans is 60 dB (Option [B]). This level corresponds to the threshold of normal conversation or background noise in a quiet room. It serves as a reference point in assessing the loudness of sounds encountered in everyday environments. Sound levels above 85 dB over extendRead more
The standard sound level for humans is 60 dB (Option [B]). This level corresponds to the threshold of normal conversation or background noise in a quiet room. It serves as a reference point in assessing the loudness of sounds encountered in everyday environments. Sound levels above 85 dB over extended periods can lead to hearing damage, while levels exceeding 120 dB are considered very loud and may cause discomfort or immediate hearing impairment.
Sound level measurements are logarithmic and relate to the intensity of sound waves. A 10 dB increase represents a tenfold increase in sound intensity, meaning 70 dB is ten times more intense than 60 dB. Noise exposure guidelines recommend limiting exposure to levels above 85 dB for extended periods to prevent hearing loss. Various occupational safety regulations and environmental noise standards use dB measurements to assess and mitigate the impact of noise on human health and wellbeing. Therefore, among the options provided, 60 dB is considered the standard sound level for typical human hearing conditions.
Acoustic science (Option [B]) is related to sound. It is a branch of science that deals with the study of sound waves and their behavior in various mediums, including air, water, and solids. Acoustics encompasses the production, transmission, and reception of sound, as well as its effects on biologiRead more
Acoustic science (Option [B]) is related to sound. It is a branch of science that deals with the study of sound waves and their behavior in various mediums, including air, water, and solids. Acoustics encompasses the production, transmission, and reception of sound, as well as its effects on biological, environmental, and technological systems.
In acoustic science, researchers explore topics such as sound propagation, resonance, sound absorption, and the interaction of sound waves with different materials. Applications of acoustic science include the design of musical instruments, development of soundproofing materials, improvement of concert hall acoustics, medical ultrasound imaging, underwater acoustics for marine communication and navigation, and noise control in industrial settings.
Acoustic science is distinct from other fields such as optics (Option [A]), climatology (Option [C]), and metallurgy (Option [D]), which focus on light, climate patterns, and metals respectively. Therefore, acoustic science specifically investigates the properties and behaviors of sound waves, making it essential in various scientific, engineering, and practical applications related to sound.
Echo sounding is used to measure the depth of the sea (Option [C]). It involves the transmission of sound waves, typically low-frequency, into the water. These waves travel through the water until they encounter the seafloor, where they are reflected back to the surface. By measuring the time it takRead more
Echo sounding is used to measure the depth of the sea (Option [C]). It involves the transmission of sound waves, typically low-frequency, into the water. These waves travel through the water until they encounter the seafloor, where they are reflected back to the surface. By measuring the time it takes for the sound waves to make this round trip, echo sounding systems can accurately calculate the depth of the water.
This technique is crucial for maritime navigation, underwater mapping, and scientific research. It allows ships to determine safe passage routes, avoid shallow areas, and map the contours of the ocean floor. Echo sounding is based on the principle of sound wave reflection, where the depth is directly proportional to the time delay between transmission and reception of the sound waves.
Options [A] and [B] are incorrect because echo sounding does not involve generating vibrations or increasing the frequency of sound waves. Therefore, among the options provided, echo sounding is specifically used to measure the depth of the sea through the reflection of sound waves.
On hearing thunder, a person opens his mouth so that
On hearing thunder, a person opens his mouth so that to equalize the air pressure on the eardrum of both the ears (Option [B]). Thunder is often accompanied by a sudden change in atmospheric pressure. By opening the mouth slightly, the person can equalize the pressure inside and outside the ear canaRead more
On hearing thunder, a person opens his mouth so that to equalize the air pressure on the eardrum of both the ears (Option [B]). Thunder is often accompanied by a sudden change in atmospheric pressure. By opening the mouth slightly, the person can equalize the pressure inside and outside the ear canal, reducing discomfort or pain caused by the pressure difference. This action helps prevent the eardrums from being pushed inward or outward abruptly, which can occur during rapid changes in air pressure.
Options [A] and [C] are less likely reasons because fear does not directly relate to opening the mouth, and opening the mouth does not significantly affect sound reception compared to the function of equalizing pressure. Option [D] is incorrect as opening the mouth is not primarily intended to expel air. Therefore, among the options provided, equalizing the air pressure on both eardrums is the most plausible reason for opening the mouth upon hearing thunder.
See lessThe instrument used to detect submerged objects is called
The instrument used to detect submerged objects is called "Sonar" (Option [B]). Sonar stands for Sound Navigation and Ranging. It works by emitting sound waves into water and then detecting the echoes reflected back from underwater objects, such as submarines, ships, or even the seafloor. By measuriRead more
The instrument used to detect submerged objects is called “Sonar” (Option [B]). Sonar stands for Sound Navigation and Ranging. It works by emitting sound waves into water and then detecting the echoes reflected back from underwater objects, such as submarines, ships, or even the seafloor. By measuring the time it takes for the sound waves to return, sonar systems can calculate the distance to these objects and create detailed maps of underwater environments.
Sonar technology is crucial for various applications, including military defense, underwater exploration, navigation, fishing, and marine research. There are different types of sonar systems, such as passive sonar (listening for sounds generated by objects) and active sonar (emitting pulses of sound and analyzing the returning echoes). This technology enables ships to navigate safely through underwater hazards, helps fishermen locate schools of fish, aids in the search and recovery of submerged objects, and supports scientific investigations of oceanography and marine biology.
Options [A] Radar, [C] Quasar, and [D] Pulser are not instruments used for detecting submerged objects, distinguishing them from sonar in underwater detection applications.
See lessStandard sound level for humans is
The standard sound level for humans is 60 dB (Option [B]). This level corresponds to the threshold of normal conversation or background noise in a quiet room. It serves as a reference point in assessing the loudness of sounds encountered in everyday environments. Sound levels above 85 dB over extendRead more
The standard sound level for humans is 60 dB (Option [B]). This level corresponds to the threshold of normal conversation or background noise in a quiet room. It serves as a reference point in assessing the loudness of sounds encountered in everyday environments. Sound levels above 85 dB over extended periods can lead to hearing damage, while levels exceeding 120 dB are considered very loud and may cause discomfort or immediate hearing impairment.
Sound level measurements are logarithmic and relate to the intensity of sound waves. A 10 dB increase represents a tenfold increase in sound intensity, meaning 70 dB is ten times more intense than 60 dB. Noise exposure guidelines recommend limiting exposure to levels above 85 dB for extended periods to prevent hearing loss. Various occupational safety regulations and environmental noise standards use dB measurements to assess and mitigate the impact of noise on human health and wellbeing. Therefore, among the options provided, 60 dB is considered the standard sound level for typical human hearing conditions.
See lessAcoustic science is
Acoustic science (Option [B]) is related to sound. It is a branch of science that deals with the study of sound waves and their behavior in various mediums, including air, water, and solids. Acoustics encompasses the production, transmission, and reception of sound, as well as its effects on biologiRead more
Acoustic science (Option [B]) is related to sound. It is a branch of science that deals with the study of sound waves and their behavior in various mediums, including air, water, and solids. Acoustics encompasses the production, transmission, and reception of sound, as well as its effects on biological, environmental, and technological systems.
In acoustic science, researchers explore topics such as sound propagation, resonance, sound absorption, and the interaction of sound waves with different materials. Applications of acoustic science include the design of musical instruments, development of soundproofing materials, improvement of concert hall acoustics, medical ultrasound imaging, underwater acoustics for marine communication and navigation, and noise control in industrial settings.
Acoustic science is distinct from other fields such as optics (Option [A]), climatology (Option [C]), and metallurgy (Option [D]), which focus on light, climate patterns, and metals respectively. Therefore, acoustic science specifically investigates the properties and behaviors of sound waves, making it essential in various scientific, engineering, and practical applications related to sound.
See lessEcho sounding is used for
Echo sounding is used to measure the depth of the sea (Option [C]). It involves the transmission of sound waves, typically low-frequency, into the water. These waves travel through the water until they encounter the seafloor, where they are reflected back to the surface. By measuring the time it takRead more
Echo sounding is used to measure the depth of the sea (Option [C]). It involves the transmission of sound waves, typically low-frequency, into the water. These waves travel through the water until they encounter the seafloor, where they are reflected back to the surface. By measuring the time it takes for the sound waves to make this round trip, echo sounding systems can accurately calculate the depth of the water.
This technique is crucial for maritime navigation, underwater mapping, and scientific research. It allows ships to determine safe passage routes, avoid shallow areas, and map the contours of the ocean floor. Echo sounding is based on the principle of sound wave reflection, where the depth is directly proportional to the time delay between transmission and reception of the sound waves.
Options [A] and [B] are incorrect because echo sounding does not involve generating vibrations or increasing the frequency of sound waves. Therefore, among the options provided, echo sounding is specifically used to measure the depth of the sea through the reflection of sound waves.
See less