Jasvinder Kaur Randhawa Solutions for Exercise 2: TEST YOUR SKILLS

What is the audible range of frequency (in $\mathrm{Hz}$) for human beings? (Choose out of: $40$ to $350$, $20$ to $20000$, $20$ to $2000$)

What is the minimum distance required to hear the distinct echo?

(Take speed of sound in air $=344 \mathrm{m}/\mathrm{s}$)

(Choose the answer from : $17.2 \mathrm{metre}/34.4 \mathrm{metre}$)

What should be the time interval (in second's) between the originated sound and the reflected sound to be heard distinctly?

($0.1 \mathrm{s}$, $0.01 \mathrm{s}$, $0.2 \mathrm{s}$, $0.02 \mathrm{s}$)

A ship sends out ultrasound waves that return from the seabed and is detected after $3.42 \mathrm{s}$. If the speed of ultrasound waves through seawater is $1531 \mathrm{m}/\mathrm{s}$. What is the distance of the seabed from the ship?

Define amplitude, time period and frequency of sound waves.

With the help of an activity show that sound cannot travel in vacuum.

Give three uses of ultrasound.

What is SONAR?