Waves 2 Flashcards

1
Q

What 3 things could happen when waves meet a boundary

A

Totally or partially reflected
Transmitted through the substance
Absorbed by substance

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2
Q

What is sound caused by

A

Mechanical vibrations

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3
Q

What is an echo

A

When sound waves are reflected from hard flat surfaces.

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4
Q

What does the pitch of a note depend on

A

Depends on the frequency of the sound wave

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5
Q

How can we investigate waves

A

-Ripple tank for water waves
-loudspeaker for sound waves

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6
Q

What does the higher frequency of a sound wave mean

A

The higher the pitch

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7
Q

What does the loudness of a sound depend on

A

The amplitude of the sound wave

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8
Q

What range can human ears hear

A

20Hz to 20kHz

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9
Q

What is an ultrasound wave

A

Wave above 20kHz

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10
Q

Are ultra sound waves reflected at a boundary between two different substances

A

Partly reflected

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11
Q

How can you calculate the distance using ultrasound waves

A

Ultra sound waves reflected at a boundary are timed, the timing are used to calculate the distances

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12
Q

What is ultra sound used for

A

In medicine for scanning inside the body

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13
Q

What is a seismic wave

A

A wave that travels through the earth

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14
Q

What type of wave is a primary wave

A

Longitudinal

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15
Q

What type of wave is a secondary wave

A

Transverse

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16
Q

How is earthquake activity measured

A

Seisometers

17
Q

What is an optical fibre

A

Transmits information as light pulses along a glass or plastic fibre

18
Q

what happens to the speed and frequency of waves when they are reflected

A

they do not change