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 10
A person moves away from a sound source. What happens to the loudness of the sound they hear?
A sound wave has an amplitude of 0.02 m. If the amplitude is increased to 0.04 m, by what factor does the loudness increase?
A sound wave has an amplitude of 3 units. If its amplitude is increased to 6 units, by what factor does its loudness change?
A sound wave has an amplitude of 5 units and a frequency of 500 Hz. If the amplitude is reduced to 2.5 units, what happens to the loudness?
Describe how the amplitude of a sound wave can be increased in a musical instrument.
Describe how the loudness of sound changes as you move closer to or farther from the source.
Explain why a drum hit softly and a drum hit hard produce sounds of different loudness.
Explain why shouting produces a louder sound than whispering.
If a sound has a loudness of 60 dB and another has a loudness of 70 dB, how many times more intense is the second sound compared to the first?
If the amplitude of a sound wave is doubled, what happens to its loudness?
If the amplitude of a sound wave is tripled, by what factor does the energy carried by the wave increase?
What is the relationship between the amplitude of a sound wave and its loudness?
A factory machine produces a sound with a measured intensity of 1.0 × 10-4 W/m2. If the threshold of hearing is 1.0 × 10-12 W/m2, calculate the sound level in decibels (dB).
A sound wave in air has an amplitude of 0.01 m and produces a certain loudness. If the amplitude is increased to 0.05 m, by what factor does the energy transported by the wave increase?
Explain why the loudness of a sound decreases as it travels through a medium, even if the amplitude at the source remains constant.
If the intensity of a sound wave is increased by a factor of 100, by how many decibels does the loudness increase?
Two students are listening to the same sound source. Student A is standing in air, while Student B is underwater at the same distance from the source. Assuming the amplitude of the sound wave is the same in both media, which student perceives the sound as louder? Explain your answer.
A sound wave has an intensity of 1.0 × 10-6 W/m2. If the amplitude of the wave is halved, what will be the new intensity?
A sound wave in air has an amplitude of 0.03 m and produces a certain loudness. If the amplitude is reduced to 0.01 m, by what factor does the intensity of the sound change?
A sound wave travels from air into water. If the amplitude of the wave remains the same, how does the perceived loudness change and why?
