SOUND1

How is transmission of sound affected by the kind of material?

Why is it hard for us to hear sound during daytime when we are in an open field?

How does temperature affect the speed of sound?

ACTIVITY
FASTER SOUND… IN HOTTER OR COOLER?
(20 mins)

PRESENTATION OF OUTPUTS

Sound travels through air by causing air molecules to vibrate.
The temperature of the air can affect how sound waves travel.

During day time, The ground heats up, causing the air near the surface to become warmer than the air above. This cause sound wave to bend upwards, away from the ground, making it harder for us to hear distant sounds. At night, the grounds cools down, and the air near the surface of the earth becomes cooler than above, which can cause sound waves to bend downwards, making distant sounds more audible.

Draw

What is the speed of sound at 35^o C?

Draw

What is the speed of sound at -20^o C?

Multiple Choice

1.    Speed of sound is unaffected by the temperature of the medium.

• TRUE

• FALSE

Multiple Choice

2.   With the increase in temperature, kinetic energy increases causing increase in vibrations and faster speed of sound.

• TRUE

• FALSE

Multiple Choice

3.   At which temperature will sound waves travel fastest?

• 5 °C

• 10 °C

• 20 °C

• 40 °C

Multiple Choice

3.   At which temperature will sound waves travel the slowest?

• 5 °C

• 10 °C

• 20 °C

• 40 °C

Fill in the Blanks

5. The speed of sound, like all waves, depends on the

   through which it travels.

Fill in the Blanks

6. Sound travels fastest in

   (solids, liquids, gases) and slowest in gas.

Fill in the Blanks

The speed of sound in air depends on the 7. ___________________ of the air. At 0 o C, the speed of sound in air is ______________ m/s. For every degree above 0o C, the speed _____________ by 0.6 m/s. For every degree below 0o C, the speed __________________by 0.6 m/s

Fill in the Blanks

The speed of sound in air depends on the temperature of the air. At 0 ^o C, the speed of sound in air is 7._________ m/s. For every degree above 0^o C, the speed _____________ by 0.6 m/s. For every degree below 0o C, the speed __________________by 0.6 m/s

Fill in the Blanks

The speed of sound in air depends on the temperature of the air. At 0 ^o C, the speed of sound in air is 331 m/s. For every degree above 0^o C, the speed 9.____________ by 0.6 m/s. For every degree below 0^o C, the speed __________________by 0.6 m/s

Fill in the Blanks

The speed of sound in air depends on the temperature of the air. At 0 ^o C, the speed of sound in air is 331 m/s. For every degree above 0^o C, the speed increase by 0.6 m/s. For every degree below 0^o C, the speed 10

by 0.6 m/s

Create wind chimes made of indigenous materials.