Question

What should be the distance from the cliff if a person needs to hear the echo

of his voice after 5 s, provided speed of the sound is 345 ms-1.

b. What would be the velocity of a wave with frequency of 20 Hz and wavelength

of 20 m? Mention if the frequency of the sound will be audible here? ​

Answer 1

Answer:

Equivalently, for 20 kHz, which is the highest frequency most humans can hear, the wavelength would be 340 metres divided by 20,000, and that is 1.7 cm.