Question

A. Choose the correct option.
1. The greater the surface area of vibrating body
a) lesser
is the loudness of sound.
b) greater
d) none of the above
c) same
2. Decibel is the unit used for
a) speed of light
b) intensity of heat
c) loudness of sound
d) radio wave frequency
3. A man standing at the finish line is recording time of a race competition by means of a stop watch.
He must start the watch when
a) he hears sound of starting gun.
b) he sees flash of light from the gun.
c) he sees the first man leaving the start line. d) he either sees a flash or hears the sound.
4. SONAR uses which of the following to find depth of the sea?
a) Wave
b) Echo
c) Frequency
d) Amplitude​

Answer 1

Answer:

1-greater

2-loudness of sound

3- he hears the sound of starting gun

4- echo

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