Question

5. Kiran blows a normal whistle, at 10,000 Hz, and Rohan blows an ultrasonic whistle, at 25,000 Hz, from the same spot exactly at the same instant. Samir stands at a distance of 1000 metres with an apparatus ready to detect the sound. His apparatus can detect and record vibrations over a wide range upto 28,000 Hz. What is true about the sounds of these two whistles?
a) Samir will hear two sounds.
b) Samir will hear only one sound.
c) Samir's apparatus will detect no sound.
d) Samir's apparatus will detect only one sound.

Answer 1

Ans:Samir will only hear one sound but can detect two because a human can only detect up to 25,000 Hz

Answer 2

Answer:

Samir will only hear one sound as the audible range for hearing a sound for a human is 20-20000Hz

Explanation: