P9: Sound and Ultrasound Flashcards

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1
Q

Can sound waves travel through a vacuum?

A

They are mechanical: no.

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2
Q

What speed does sound travel at?

A

340m/s

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3
Q

What is a humans frequency range?

A

20 - 20 000 Hz

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4
Q

Echoes

A

Sound waves reflected from a smooth, hard surface.

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5
Q

Loud and High Pitched

A
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6
Q

Loud and Low Pitched.

A
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7
Q

Increasing the loudness of a sound…

A

… Increases its amplitude.

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8
Q

Increasing the frequency of a sound…

A

…Increases its pitch.

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9
Q

Ultrasound Waves

A

A sound wave undetectable to the human ear (too high)

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10
Q

Positives of ultrasound

A

Non-ionising

Produces images of organ tissues as well as bones.

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11
Q

How does an ultrasound transducer work?

A

The waves it emits are partially reflected by different tissue boundaries in its path.

These return to the transducer as a sequence of pulses that build up an image of the internal body.

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12
Q

Distance travelled by an ultrasound pulse =

A

speed of ultrasound waves in body tissue x time taken.

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13
Q
A
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14
Q
A

Loud and High Pitched

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15
Q
A

Loud and Low Pitched.

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