David Sang and Darrell Hamilton Solutions for Chapter: Sound, Exercise 1: Exercise 12.1

State what we call a reflected sound.

State the speed of sound in air.

State the normal hearing range for humans.

Arun can hear sounds with frequencies up to $20 \mathrm{kHz}$. His grandfather cannot hear sounds above $12 \mathrm{kHz}$. Which two of the following sound frequencies will Arun hear, but his grandfather will not?

You can probably hear notes of higher pitch than your teacher. Describe how you would show this in the school laboratory.

Calculate how long a sound will take to travel $1 \mathrm{km}$ in air. Give your answer in seconds, to one decimal place.

Calculate how far the sound will travel in $5 \mathrm{s}$ in the air.

In an experiment to measure the speed of sound in glass, a pulse of sound is sent into a glass rod, $14.0 \mathrm{m}$ in length. The reflected sound is detected after $5.6\mathrm{ms} (0.0056 \mathrm{s})$. Calculate the speed of sound in glass.