Question

A bee vibrates its wings 660 times in a second while pendulum vibrates 15 times in a
second. Which vibrations are likely to be heard by humans? Explain.
PLS EXPLAIN IT FAST ITS URGENT... NO WRONG ANSWERS

Answer 1

Answer:

Bee

Explanation:

Frequency of bee = 660 Hz

Frequency of pendulum = 15 Hz

Humans can hear the following frequency :- 20 Hz to 20000 Hz.

Clearly, pendulum is not in this range but bee is.

So, we will be able to hear the bee.

Answer 2

Explanation:

Any vibrating body will produce sound unless it is in vacuum, in which case off course there would not be any sound, since sound requires a medium to propagate. When a pendulum swings from side to side it will obviously collide with the air particles in the air and they might vibrate a bit too producing some sound. But we don't hear it.

The vibrations do reach our ears, but because we can only hear from 20 Hz to 20,000 Hz , we don't hear it. The frequency of sound produced due to vibrations of seconds pendulum is 0.5 Hz which is infrasonic sound.

Hence, the seconds pendulum is not heard.