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The science of Sound
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If you just shake your hand in air, will you be able to hear a sound? Why?
No. Because the air molecules vibrate at a frequency lesser than 20Hz
When will you hear the sound faster? through hot water or cold water? why?
hot water because the kinetic energy of the molecules is high and hence it will vibrate faster
What should be the minimum distance between the reflecting surface and the person shouting, for an echo to be heard?
the distance should be at least 17 m
People are bursting crackers below your building and it is disturbing you while studying. What will you do to lessen the noise you hear?
draw curtains as curtains are good absorbers of sound, or close the windows so that the sound gets reflected from the windows outside or put on headphones
Why are the ceilings of theatres/conference halls curved?
To allow maximum reflection of sound towards the audience
Identify & define the term represented by L
Wavelength: The length of a wave along X axis OR the distance between 2 consecutive crests or troughs
Identify the terms A & B
A = trough, B = crest
Identify the part of the sound wave that has changed and define it.
Frequency: The number of oscillations made by a wave in unit time.
What is the unit of measuring amplitude?
metre (m)
Observe the diagram and define the part of the sound wave that has changed
Amplitude: The maximum displacement of a wave on either side of its mean position
Why does blowing into a trumpet make sound?
When we blow into a trumpet, we cause the air inside the trumpet to vibrate which in turn makes sound
Will a person on the moon be able to hear the noise of nuclear explosions happening on the sun?
No because sound does not travel in space.
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