Lakhmir Singh and Manjit Kaur Solutions for Chapter: Sound, Exercise 27: Short Answer Type Questions

What is the range of frequencies associated with:
audible sound
 

What is the range of frequencies associated with:
ultrasound ?

What is the difference between infrasonic waves and ultrasonic waves?

Choose the infrasonic waves and ultrasonic waves from the following frequencies:
(i) $\mathrm{10,000} \mathrm{H}\mathrm{z}$
(ii) $\mathrm{30,000} \mathrm{H}\mathrm{z}$
(iii) $18 \mathrm{H}\mathrm{z}$
(iv) $\mathrm{50,000} \mathrm{H}\mathrm{z}$
(v) $10 \mathrm{H}\mathrm{z}$

What is the frequency range of hearing in humans?

Which of the following sound frequencies cannot be heard by a human ear?

The echo of a sound is heard after $5$ seconds. If the speed of sound in air be $342 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{s}$}\right.$ calculate the distance of the reflecting surface. 

The speed sound in water is $1500$ metres per of second. How far away from an under-sea rock should a deep-sea diver be so that he can hear his own echo?