Waves Flashcards

1
Q

What are sound waves known as?

A

Longitudinal waves

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2
Q

The denser the medium, the

A

faster the sound travels through it

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3
Q

What frequency of sound can human hear?

A

20-20 000Hz

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4
Q

The greater the amplitude the…

A

more energy and so the louder it is.

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5
Q

The higher the frequency the higher the…

A

pitch.

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6
Q

Frequency=

A

The number of complete vibrations per second

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7
Q

kHz is

A

1000Hz

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8
Q

MHz is

A

100000Hz

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9
Q

What sort wavelength does a high frequency sound produce?

A

a shorter wavelength

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10
Q

Sawtooth waveform

A

sloping ups and vertical downs or vice versa reates a buzzy brassy sound

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11
Q

Pulse wave

A

Rectangular peaks and troughs, makes a thin reedy sound.

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12
Q

square wave

A

Peaks the same length as trough, makes a hollow sound.

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13
Q

triangle wave

A

similar to sine waves but make a weaker more mellow sound.

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14
Q

What is ultrasound?

A

Sound with a higher frequency than we can hear.

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15
Q

What is meant by partial reflection?

A

When a wave passes from one medium to another some of the wave is reflected off the boundary and some is transmitted.

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16
Q

What is used to find the distance to the boundary?

A

The time taken and speed taken for the ultrasound to be reflected back.

17
Q

Advantages of ultrasound cleaning.

A

Can clean delicate mechanisms, be directed into precise areas and are extremely effective at removing dirt and other deposits.

18
Q

How does ultrasound remove dirt?

A

Breaks up dirt and crud into very small particles which just fall off the equipment.

19
Q

What can ultrasound be used for?

A

Industrial cleaning, industrial quality control (echos processed by a computer) and pre- Natal scanning.