Q.16 :-If the amplitude of a vibrating membrane is increased by 50%, then the loudness of sound will increase by
50%
100%
125%
150%

B. 100%

Explanation:

When the amplitude of a vibrating membrane increases the loudness of sound increases. Higher amplitude waves will mean more energy and greater intensity which causes the sound to be louder.

Loudness is proportional to the square of the amplitude. This will simply mean when the amplitude of a wave is doubled, the sound will be 4 times louder.

In this case, 50% increase in the amplitude of a vibrating membrane will cause a 100% increase in the loudness of sound.

does anyone know or what?

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.