P2a-Sound Waves Flashcards

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1
Q

What is an echo?

A

An echo is a sound going back and forth on an object.

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2
Q

What is the frequency of ultrasound?

A

The frequency of ultrasound is higher than 20,000Hz (hertz).

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3
Q

State two uses of ultrasound?

A

Seeing babies in the mothers womb and stopping certain types of cancer.

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4
Q

What are the different parts of the ear?

A

The eardrum, the pinna, the auditory nerve, the ossicles and the cochlea.

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5
Q

What is the humans audible range?

A

The humans audible range is roughly (depending on your age) 20-20,000Hz.

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6
Q

What produces a sound wave?

A

Vibrations cause a sound wave.

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7
Q

What is the speed of sound?

A

The speed of sound is 340m/sin air.

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8
Q

Name three types of medium that sound can travel through.

A

Gas, liquid and solid.

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9
Q

Copy and complete.

Sound is produced by objects that are……….. . This makes the air molecules………and produces a sound wave. Sound travels fastest in………..and slowest in…………, and it cannot travel through a…….. .

A

Sound is produced by objects that are vibrating. This makes the air molecules vibrate and produces a sound wave. Sound travels fastest in solids and slowest in gasses, and it cannot travel through a vacuum.

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10
Q

What is a longitudinal wave?

A

Is when the energy transfers parallel to the oscillation.

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11
Q

What is a transverse wave?

A

The oscillations are perpendicular to the directions in which the energy transfers.

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