Loudness and Amplitude
Physics ⇒ Waves and Sound
Loudness and Amplitude starts at 7 and continues till grade 12.
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See sample questions for grade 11
A person increases the volume on a speaker. Which property of the sound wave is being changed?
A sound has an intensity of 1 × 10⁻⁶ W/m². Calculate its intensity level in decibels (dB) relative to the threshold of hearing.
A sound wave has an amplitude of 0.01 m and produces a loudness of 40 dB. What will be the loudness if the amplitude is increased to 0.02 m?
A sound wave has an amplitude of 0.02 m. If the amplitude is increased to 0.06 m, how does the loudness change?
A sound wave has an intensity of 1 × 10⁻⁴ W/m². What is its intensity level in decibels?
Describe how the human ear perceives changes in amplitude of a sound wave.
A factory siren emits a sound with an intensity level of 90 dB at a distance of 10 meters. Assuming no energy loss to the environment, what would be the intensity level in dB at a distance of 100 meters from the siren?
A sound wave in water has a much higher intensity than a sound wave in air, but both are perceived as equally loud by a human listener. Explain why this is possible.
Which of the following best describes the effect of increasing amplitude on a sound wave? (1) Increases pitch (2) Increases loudness (3) Increases speed (4) Increases wavelength
Which of the following best explains why a whisper and a shout have different loudness? (1) Different frequencies (2) Different amplitudes (3) Different wavelengths (4) Different speeds
Which of the following is NOT a factor affecting the loudness of a sound? (1) Amplitude (2) Frequency (3) Distance from source (4) Medium of propagation
Which of the following is the correct formula for sound intensity level in decibels? (1) L = 10 log(I/I₀) (2) L = 20 log(I/I₀) (3) L = 100 log(I/I₀) (4) L = log(I/I₀)
Fill in the blank: The amplitude of a sound wave is measured in ________.
Fill in the blank: The decibel scale is a ________ scale used to measure loudness.
Fill in the blank: The human ear is most sensitive to frequencies around ________ Hz.
Loudness is a ________ quantity because it depends on the listener's perception.
True or False: Loudness and amplitude are always directly proportional.
True or False: The decibel scale is linear.
True or False: The loudness of a sound is directly proportional to the square of its amplitude.
True or False: Two sounds with the same amplitude will always be perceived as equally loud by all listeners.
