15) Sound Flashcards

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1
Q

How is a sound produced?

A

vibrations

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2
Q

What type of wave is a sound wave?

A

longitudinal wave

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3
Q

Describe how sound waves travels through air.

A

Sound is a longitudinal wave in which the direction of wave travel is parallel to the direction of vibration of the particles.
The vibration of the particles causes a series of compressions and rarefactions in the air which transmit sound through the air.

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4
Q

What is an echo?

A

The reflection of sound from a large and hard surface.

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5
Q

Which property of a wave affects the pitch of a sound?

A

frequency

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6
Q

Which property of a wave affects the loudness of a sound?

A

amplitude

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7
Q

How would the pitch of a sound change if its frequency of the waves doubles?

A

pitch increases or

pitch gets higher.

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8
Q

How would the loudness of a sound change if its amplitude of the waves decreases?

A

the sound gets softer

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9
Q

State the audible range of frequency for the human ear?

A

20 Hz to 20 000 Hz

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10
Q

Define ultrasound.

A

Ultrasound is a type of sound wave with frequencies more than 20 000 Hz.

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11
Q

State one application of ultrasound.

A

Used in cleaning small items in an ultrasonic cleaner or
in SONAR to measure distances in water or
in detecting growth of foetuses in pregnant woman.

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12
Q

State the speed of sound in air.

A

330 m/s

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13
Q

What is the unit for loudness of sound?

A

decibel

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