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Slide 1

Sound

Sound

The sound waves that most humans cannot hear are

infrasonic.

ultrasonic.

Both of these.

None of the above, for young people can hear both.

Slide 2

The sound waves that most humans cannot hear are

The sound waves that most humans cannot hear are

infrasonic.

ultrasonic.

Both of these.

None of the above, for young people can hear both.

Slide 3

Sound travels in air by a series of

Sound travels in air by a series of

compressions.

rarefactions.

Both of these.

None of these.

Slide 4

Sound travels in air by a series of

Sound travels in air by a series of

compressions.

rarefactions.

Both of these.

None of these.

Slide 5

The vibrations set up in a radio loudspeaker have the same frequencies as the vibrations

The vibrations set up in a radio loudspeaker have the same frequencies as the vibrations

in the electric signal feeding the loudspeaker.

that produce the sound you hear.

Both of these.

None of these.

Slide 6

The vibrations set up in a radio loudspeaker have the same frequencies as the vibrations

The vibrations set up in a radio loudspeaker have the same frequencies as the vibrations

in the electric signal feeding the loudspeaker.

that produce the sound you hear.

Both of these.

None of these.

Slide 7

Sound travels in

Sound travels in

solids.

liquids.

gases.

All of these.

Slide 8

Sound travels in

Sound travels in

solids.

liquids.

gases.

All of these.

Slide 9

In which of these materials does sound travel fastest?

In which of these materials does sound travel fastest?

Air

Water

Steel

All the same at the same temperature

Slide 10

In which of these materials does sound travel fastest?

In which of these materials does sound travel fastest?

Air

Water

Steel

All the same at the same temperature

Slide 11

The speed of sound varies with

The speed of sound varies with

amplitude.

frequency.

temperature.

All of these.

Slide 12

The speed of sound varies with

The speed of sound varies with

amplitude.

frequency.

temperature.

All of these.

Explanation: Although loudness varies with amplitude, and pitch varies with frequency, speed is not influenced by amplitude nor frequency. A listener in the back row at a concert would find music confusing if sound of different frequencies reached the ear at different times.

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