Two people cannot hear each other on the surface of the Moon primarily because [B] there is no atmosphere on the Moon. Sound waves propagate through a medium, such as air, where molecules carry the vibrations from a sound source to a listener's ears. On the Moon, the vacuum of space extends to its sRead more
Two people cannot hear each other on the surface of the Moon primarily because [B] there is no atmosphere on the Moon. Sound waves propagate through a medium, such as air, where molecules carry the vibrations from a sound source to a listener’s ears. On the Moon, the vacuum of space extends to its surface, devoid of any significant atmosphere or medium that could transmit sound.
While special types of space suits (option [C]) are indeed worn on the Moon, they are primarily for providing life support and protection against the harsh lunar environment, not for transmitting sound. The lack of atmosphere also means that sound waves cannot travel, making communication via sound impossible without the aid of electronic devices or radio communication.
Thus, the absence of an atmosphere on the Moon is the key reason why sound cannot travel and be heard between two people on its surface.
The phenomenon where the sound of a whistle of an approaching train increases in pitch while it decreases for a train moving away is known as the Doppler effect. This effect occurs due to the relative motion between the source of sound (the train) and the observer (a person standing on the platform)Read more
The phenomenon where the sound of a whistle of an approaching train increases in pitch while it decreases for a train moving away is known as the Doppler effect. This effect occurs due to the relative motion between the source of sound (the train) and the observer (a person standing on the platform).
As the train approaches, the sound waves are compressed, resulting in a higher frequency and perceived pitch (this is called a blueshift). Conversely, as the train moves away, the sound waves are stretched, causing a lower frequency and perceived pitch (this is called a redshift). The Doppler effect is not only observed with sound but also with electromagnetic waves such as light, which astronomers use to determine the velocities of stars and galaxies.
Understanding the Doppler effect is crucial in various fields, including transportation, meteorology, and astronomy, for interpreting relative motion and velocity based on observed frequency shifts.
Among the options provided, [D] Airplane taking off causes the most noise pollution. When airplanes take off, their engines produce significant noise levels, often exceeding 100 decibels near airports. This noise impacts surrounding communities, affecting quality of life and potentially causing healRead more
Among the options provided, [D] Airplane taking off causes the most noise pollution. When airplanes take off, their engines produce significant noise levels, often exceeding 100 decibels near airports. This noise impacts surrounding communities, affecting quality of life and potentially causing health issues such as stress, sleep disturbances, and hearing impairment. Motor vehicles, while widespread, generally produce lower noise levels compared to airplanes. Railway engines also emit considerable noise, but their impact is localized to specific areas near railway tracks. Pop music, although loud in concert settings, does not have the widespread and continuous noise emissions that aircraft taking off do. Thus, aircraft taking off are identified as the primary source of noise pollution among the options due to their high intensity and widespread impact on surrounding areas.
The maximum limit of sound intensity in decibels above which a person cannot hear is 95 dB. This threshold signifies the minimum sound level that can be perceived by the human ear under ideal conditions. Sounds below this intensity level are considered inaudible to most individuals. Understanding thRead more
The maximum limit of sound intensity in decibels above which a person cannot hear is 95 dB. This threshold signifies the minimum sound level that can be perceived by the human ear under ideal conditions. Sounds below this intensity level are considered inaudible to most individuals. Understanding this limit is crucial in various fields, including occupational safety, where exposure to high decibel levels can lead to hearing loss over time. Regulations and guidelines often use this threshold to define safe exposure limits to noise in workplaces and public environments. Monitoring sound levels and ensuring they do not exceed 95 dB helps protect auditory health and ensures compliance with safety standards. Therefore, the correct answer to the question is [D] 95 dB.
Among the options provided, polarization is not produced by sound waves in air. Sound waves are longitudinal waves, meaning the vibrations occur in the same direction as the wave propagation. Unlike transverse waves, such as light waves, which can be polarized, sound waves cannot exhibit polarizatioRead more
Among the options provided, polarization is not produced by sound waves in air. Sound waves are longitudinal waves, meaning the vibrations occur in the same direction as the wave propagation. Unlike transverse waves, such as light waves, which can be polarized, sound waves cannot exhibit polarization because they do not oscillate perpendicular to their direction of travel.
However, sound waves in air can undergo diffraction, reflection, and refraction. Diffraction refers to the bending of sound waves around obstacles or through openings. Reflection occurs when sound waves bounce off surfaces. Refraction involves the bending of sound waves as they pass from one medium to another with different acoustic properties.
Understanding these phenomena helps in various applications, from designing acoustic spaces to predicting sound behavior in different environments. Therefore, the correct answer to the question is [A] Polarization.
If the same note is played on sitar and flute, the sound produced by them can be distinguished primarily due to the difference in sound quality. Sound quality, also known as timbre, refers to the unique characteristic of a sound that distinguishes it from other sounds, even when they have the same pRead more
If the same note is played on sitar and flute, the sound produced by them can be distinguished primarily due to the difference in sound quality. Sound quality, also known as timbre, refers to the unique characteristic of a sound that distinguishes it from other sounds, even when they have the same pitch and loudness. The sitar and flute produce different timbres because of their different construction, materials, and playing techniques. The sitar typically has a rich, resonant sound with complex overtones, while the flute produces a clear, pure sound with simpler overtones. This difference in timbre allows listeners to discern which instrument is playing the note, demonstrating how sound quality plays a crucial role in music appreciation and instrument identification. Therefore, the correct answer is [D] Only sound quality.
Women's voices are thinner (shrill) compared to men's voices primarily because the frequency of their vocal vibrations is higher. Frequency refers to the rate at which the vocal cords vibrate, determining the pitch of the voice. Women typically have shorter and thinner vocal cords than men, which viRead more
Women’s voices are thinner (shrill) compared to men’s voices primarily because the frequency of their vocal vibrations is higher. Frequency refers to the rate at which the vocal cords vibrate, determining the pitch of the voice. Women typically have shorter and thinner vocal cords than men, which vibrate at faster rates, resulting in higher frequencies and higher-pitched voices. In contrast, men have longer and thicker vocal cords that vibrate at lower frequencies, producing deeper voices. The higher frequency of women’s voices contributes to their perceived thinness or shrillness compared to the lower-pitched voices of men. This difference in vocal cord physiology and vibration rates is a key factor in the distinctiveness of male and female voices. Therefore, the correct answer is [A] frequency is higher.
The voice of a small child seems more pleasing than the voice of a young man primarily because the pitch of a child's voice is higher. Children's vocal cords are shorter and thinner, causing them to vibrate at higher frequencies, which results in a higher pitch. Higher-pitched sounds are often perceRead more
The voice of a small child seems more pleasing than the voice of a young man primarily because the pitch of a child’s voice is higher. Children’s vocal cords are shorter and thinner, causing them to vibrate at higher frequencies, which results in a higher pitch. Higher-pitched sounds are often perceived as more pleasant, gentle, and less harsh compared to the lower-pitched voices of young men. Young men have longer and thicker vocal cords, which produce lower frequency vibrations, resulting in deeper voices. This difference in pitch significantly influences the perceived pleasantness of the voice. Additionally, higher-pitched voices are often associated with innocence and youth, contributing to their pleasing nature. Thus, the correct answer is [B] The pitch of a child’s voice is higher.
The voice of women is typically sharper than that of men because it has a higher pitch. Pitch is determined by the frequency of the sound waves produced by the vocal cords. Women generally have shorter and thinner vocal cords compared to men, resulting in higher frequency vibrations. These higher frRead more
The voice of women is typically sharper than that of men because it has a higher pitch. Pitch is determined by the frequency of the sound waves produced by the vocal cords. Women generally have shorter and thinner vocal cords compared to men, resulting in higher frequency vibrations. These higher frequencies produce a higher pitch, giving women’s voices their characteristic sharpness. In contrast, men usually have longer and thicker vocal cords, which vibrate at lower frequencies, resulting in a lower pitch and deeper voice. This difference in pitch is a key factor in the perceived sharpness of voices. Understanding this distinction is important in fields such as acoustics, speech therapy, and audio engineering. Hence, the correct answer is [D] Pitch is more.
The characteristic of sound that determines whether it is perceived as thick (grave) or thin (shrill) is pitch. Pitch is directly related to the frequency of the sound wave: lower frequencies result in lower pitches, producing a thick or grave sound, while higher frequencies result in higher pitchesRead more
The characteristic of sound that determines whether it is perceived as thick (grave) or thin (shrill) is pitch. Pitch is directly related to the frequency of the sound wave: lower frequencies result in lower pitches, producing a thick or grave sound, while higher frequencies result in higher pitches, producing a thin or shrill sound. For example, the deep sound of a bass drum has a low pitch, making it sound thick or grave, whereas the high-pitched sound of a whistle has a high pitch, making it sound thin or shrill. This property is crucial in music and acoustics, influencing how different sounds are perceived and categorized. Pitch enables us to distinguish between different musical notes and the tonal qualities of various instruments and voices. Hence, the correct answer is [B] Pitch.
Two people cannot hear each other on the surface of the moon because
Two people cannot hear each other on the surface of the Moon primarily because [B] there is no atmosphere on the Moon. Sound waves propagate through a medium, such as air, where molecules carry the vibrations from a sound source to a listener's ears. On the Moon, the vacuum of space extends to its sRead more
Two people cannot hear each other on the surface of the Moon primarily because [B] there is no atmosphere on the Moon. Sound waves propagate through a medium, such as air, where molecules carry the vibrations from a sound source to a listener’s ears. On the Moon, the vacuum of space extends to its surface, devoid of any significant atmosphere or medium that could transmit sound.
While special types of space suits (option [C]) are indeed worn on the Moon, they are primarily for providing life support and protection against the harsh lunar environment, not for transmitting sound. The lack of atmosphere also means that sound waves cannot travel, making communication via sound impossible without the aid of electronic devices or radio communication.
Thus, the absence of an atmosphere on the Moon is the key reason why sound cannot travel and be heard between two people on its surface.
See lessThe sound of the whistle of an approaching train increases while for a train going away it decreases. This phenomenon is an example of
The phenomenon where the sound of a whistle of an approaching train increases in pitch while it decreases for a train moving away is known as the Doppler effect. This effect occurs due to the relative motion between the source of sound (the train) and the observer (a person standing on the platform)Read more
The phenomenon where the sound of a whistle of an approaching train increases in pitch while it decreases for a train moving away is known as the Doppler effect. This effect occurs due to the relative motion between the source of sound (the train) and the observer (a person standing on the platform).
As the train approaches, the sound waves are compressed, resulting in a higher frequency and perceived pitch (this is called a blueshift). Conversely, as the train moves away, the sound waves are stretched, causing a lower frequency and perceived pitch (this is called a redshift). The Doppler effect is not only observed with sound but also with electromagnetic waves such as light, which astronomers use to determine the velocities of stars and galaxies.
Understanding the Doppler effect is crucial in various fields, including transportation, meteorology, and astronomy, for interpreting relative motion and velocity based on observed frequency shifts.
See lessWhich of the following causes the most noise pollution?
Among the options provided, [D] Airplane taking off causes the most noise pollution. When airplanes take off, their engines produce significant noise levels, often exceeding 100 decibels near airports. This noise impacts surrounding communities, affecting quality of life and potentially causing healRead more
Among the options provided, [D] Airplane taking off causes the most noise pollution. When airplanes take off, their engines produce significant noise levels, often exceeding 100 decibels near airports. This noise impacts surrounding communities, affecting quality of life and potentially causing health issues such as stress, sleep disturbances, and hearing impairment. Motor vehicles, while widespread, generally produce lower noise levels compared to airplanes. Railway engines also emit considerable noise, but their impact is localized to specific areas near railway tracks. Pop music, although loud in concert settings, does not have the widespread and continuous noise emissions that aircraft taking off do. Thus, aircraft taking off are identified as the primary source of noise pollution among the options due to their high intensity and widespread impact on surrounding areas.
See lessThe maximum limit of sound intensity in decibels above which a person cannot hear
The maximum limit of sound intensity in decibels above which a person cannot hear is 95 dB. This threshold signifies the minimum sound level that can be perceived by the human ear under ideal conditions. Sounds below this intensity level are considered inaudible to most individuals. Understanding thRead more
The maximum limit of sound intensity in decibels above which a person cannot hear is 95 dB. This threshold signifies the minimum sound level that can be perceived by the human ear under ideal conditions. Sounds below this intensity level are considered inaudible to most individuals. Understanding this limit is crucial in various fields, including occupational safety, where exposure to high decibel levels can lead to hearing loss over time. Regulations and guidelines often use this threshold to define safe exposure limits to noise in workplaces and public environments. Monitoring sound levels and ensuring they do not exceed 95 dB helps protect auditory health and ensures compliance with safety standards. Therefore, the correct answer to the question is [D] 95 dB.
See lessWhich one of the following is not produced by sound waves in air?
Among the options provided, polarization is not produced by sound waves in air. Sound waves are longitudinal waves, meaning the vibrations occur in the same direction as the wave propagation. Unlike transverse waves, such as light waves, which can be polarized, sound waves cannot exhibit polarizatioRead more
Among the options provided, polarization is not produced by sound waves in air. Sound waves are longitudinal waves, meaning the vibrations occur in the same direction as the wave propagation. Unlike transverse waves, such as light waves, which can be polarized, sound waves cannot exhibit polarization because they do not oscillate perpendicular to their direction of travel.
However, sound waves in air can undergo diffraction, reflection, and refraction. Diffraction refers to the bending of sound waves around obstacles or through openings. Reflection occurs when sound waves bounce off surfaces. Refraction involves the bending of sound waves as they pass from one medium to another with different acoustic properties.
Understanding these phenomena helps in various applications, from designing acoustic spaces to predicting sound behavior in different environments. Therefore, the correct answer to the question is [A] Polarization.
See lessIf the same note is played on sitar and flute, then the sound produced by them can be distinguished due to the difference in the following?
If the same note is played on sitar and flute, the sound produced by them can be distinguished primarily due to the difference in sound quality. Sound quality, also known as timbre, refers to the unique characteristic of a sound that distinguishes it from other sounds, even when they have the same pRead more
If the same note is played on sitar and flute, the sound produced by them can be distinguished primarily due to the difference in sound quality. Sound quality, also known as timbre, refers to the unique characteristic of a sound that distinguishes it from other sounds, even when they have the same pitch and loudness. The sitar and flute produce different timbres because of their different construction, materials, and playing techniques. The sitar typically has a rich, resonant sound with complex overtones, while the flute produces a clear, pure sound with simpler overtones. This difference in timbre allows listeners to discern which instrument is playing the note, demonstrating how sound quality plays a crucial role in music appreciation and instrument identification. Therefore, the correct answer is [D] Only sound quality.
See lessWomen’s voice is thinner (shrill) than men’s voice because women’s voice
Women's voices are thinner (shrill) compared to men's voices primarily because the frequency of their vocal vibrations is higher. Frequency refers to the rate at which the vocal cords vibrate, determining the pitch of the voice. Women typically have shorter and thinner vocal cords than men, which viRead more
Women’s voices are thinner (shrill) compared to men’s voices primarily because the frequency of their vocal vibrations is higher. Frequency refers to the rate at which the vocal cords vibrate, determining the pitch of the voice. Women typically have shorter and thinner vocal cords than men, which vibrate at faster rates, resulting in higher frequencies and higher-pitched voices. In contrast, men have longer and thicker vocal cords that vibrate at lower frequencies, producing deeper voices. The higher frequency of women’s voices contributes to their perceived thinness or shrillness compared to the lower-pitched voices of men. This difference in vocal cord physiology and vibration rates is a key factor in the distinctiveness of male and female voices. Therefore, the correct answer is [A] frequency is higher.
See lessWhy does the voice of a small child seem more pleasing than the voice of a young man?
The voice of a small child seems more pleasing than the voice of a young man primarily because the pitch of a child's voice is higher. Children's vocal cords are shorter and thinner, causing them to vibrate at higher frequencies, which results in a higher pitch. Higher-pitched sounds are often perceRead more
The voice of a small child seems more pleasing than the voice of a young man primarily because the pitch of a child’s voice is higher. Children’s vocal cords are shorter and thinner, causing them to vibrate at higher frequencies, which results in a higher pitch. Higher-pitched sounds are often perceived as more pleasant, gentle, and less harsh compared to the lower-pitched voices of young men. Young men have longer and thicker vocal cords, which produce lower frequency vibrations, resulting in deeper voices. This difference in pitch significantly influences the perceived pleasantness of the voice. Additionally, higher-pitched voices are often associated with innocence and youth, contributing to their pleasing nature. Thus, the correct answer is [B] The pitch of a child’s voice is higher.
See lessThe voice of women is more sharp than that of men because the voice of women has
The voice of women is typically sharper than that of men because it has a higher pitch. Pitch is determined by the frequency of the sound waves produced by the vocal cords. Women generally have shorter and thinner vocal cords compared to men, resulting in higher frequency vibrations. These higher frRead more
The voice of women is typically sharper than that of men because it has a higher pitch. Pitch is determined by the frequency of the sound waves produced by the vocal cords. Women generally have shorter and thinner vocal cords compared to men, resulting in higher frequency vibrations. These higher frequencies produce a higher pitch, giving women’s voices their characteristic sharpness. In contrast, men usually have longer and thicker vocal cords, which vibrate at lower frequencies, resulting in a lower pitch and deeper voice. This difference in pitch is a key factor in the perceived sharpness of voices. Understanding this distinction is important in fields such as acoustics, speech therapy, and audio engineering. Hence, the correct answer is [D] Pitch is more.
See lessDue to which characteristic of sound does a sound become thick (grave) or thin (shrill)?
The characteristic of sound that determines whether it is perceived as thick (grave) or thin (shrill) is pitch. Pitch is directly related to the frequency of the sound wave: lower frequencies result in lower pitches, producing a thick or grave sound, while higher frequencies result in higher pitchesRead more
The characteristic of sound that determines whether it is perceived as thick (grave) or thin (shrill) is pitch. Pitch is directly related to the frequency of the sound wave: lower frequencies result in lower pitches, producing a thick or grave sound, while higher frequencies result in higher pitches, producing a thin or shrill sound. For example, the deep sound of a bass drum has a low pitch, making it sound thick or grave, whereas the high-pitched sound of a whistle has a high pitch, making it sound thin or shrill. This property is crucial in music and acoustics, influencing how different sounds are perceived and categorized. Pitch enables us to distinguish between different musical notes and the tonal qualities of various instruments and voices. Hence, the correct answer is [B] Pitch.
See less