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Section C Waves And Sound Flashcards

(21 cards)

1
Q

What is wavelength on a sound wave graph?

A

The distance from one peak to the next.

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2
Q

How do you measure the wave speed?

A

Wave speed = frequency x wavelength

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3
Q

Which wave has the shortest wavelength?

A

Gamma.

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4
Q

Which wave has the longest wavelength?

A

Radio.

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5
Q

Give a use for gamma rays.

A

Sterilising food and medical equipment.

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6
Q

What are radio waves used for?

A

Communications.

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7
Q

What are microwaves used for?

A

Satellite communication and to heat up food (by absorbing water molecules).

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8
Q

What are infrared radiation waves used for?

A

Hearing and to monitor temperature.

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9
Q

What is visible light used for?

A

Photography.

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10
Q

What are UV rays used for?

A

Fluorescent lamps (which are safe because the waves are absorbed by a phosphor coating).

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11
Q

What is a use for X Rays?

A

They let us see the internal structure of objects and materials.

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12
Q

What is a danger of microwaves?

A

They can heat human body tissue.

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13
Q

What is a danger of infrared waves?

A

Can burn skin.

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14
Q

What is a danger of UV Rays?

A

Damage surface (skin) cells and cause blindness.

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15
Q

What is a danger of gamma rays?

A

Cell mutation (tissue damage leading to cancer).

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16
Q

What is the law of reflection?

A

Angle of Incidence = Angle of Reflection

17
Q

What is meant by total internal reflection?

A

When light is incident at a boundary between materials at an angle greater than the critical angle, causing light to be reflected back at the boundary.

18
Q

What is the critical angle for a boundary?

A

The angle of incidence such that the angle of refraction is 90°.

19
Q

What is the equation for finding the refracted angle?

A

n = sin i/ sin r

20
Q

What is meant by refraction?

A

When a wave changes direction when it changes speed.

21
Q

What is dispersion?

A

When white light is shone through a prism and is separated by colours.