Waves

Question 1

What do waves transfer?

Answer 1

Energy

Question 2

What is the definition of a transverse wave?

Answer 2

A wave in which the particles of the medium vibrate at right angles to the direction the wave is travelling in.

Question 3

What is the definition of a longitudinal wave?

Answer 3

a wave in which the particles of the medium vibrate parallel to the direction the wave is travelling in.

Question 4

Give me an example of a longitudinal wave

Answer 4

sound waves

Question 5

Give me an example of a transverse wave

Answer 5

water waves and electromagnetic radiation waves

Question 6

How do you measure the wavelength of a longitudinal wave?

Answer 6

From compression to compression

Question 7

How do you measure the wavelength of a transverse wave?

Answer 7

Measure from one point on one wave to the same point on another

Question 8

what do you call it when a longitudinal waves particles are spread out ?

Answer 8

Rarefaction

Question 9

How do you find the amplitude of a wave?

Answer 9

Measure from the middle to the bottom or top of the wave

Question 10

What is the top of a transverse wave called?

Answer 10

Crest

Question 11

What is the bottom of a transverse wave called?

Answer 11

Trough

Question 12

What is diffraction?

Answer 12

Diffraction is when waves bend around corners.

Question 13

Compare long wave and short wave diffraction

Answer 13

The longer the wavelength the greater the diffraction. i.e long wavelengths diffract better than short wave lengths

Question 14

describe the diffraction when the gap is the same size or smaller than the wavelength

Answer 14

Semi-circular waves are formed on the other side of the gap. i.e there is much more spreading

Question 15

Describe the diffraction when the gap is larger than the wavelength

Answer 15

Little spreading will happen

Question 16

What way in the E-m spectrum does the frequency go from low to high?

Answer 16

Radio (Low Frequency) to Gamma (High Frequency)

Question 17

What way in the E-m spectrum does the wavelength go from small to large?

Answer 17

Gamma rays ( small wavelength 10^-13m ) to Radio waves ( Large wavelength 10 m )

Question 18

What type of wave is the waves on the e-m spectrum?

Answer 18

All are Transverse

Question 19

What speed does the e-m spectrum waves travel at

Answer 19

Speed of Light ( 3x10^8 m/s)

Question 20

What is a source , detector and use for Radio waves?

Answer 20

A Source is lightning or broadcast radio towers , A detector of Radiowaves is an aerial or antenna and A use for radiowaves is communication

Question 21

What is a source, detector and use for Microwaves?

Answer 21

A source is the sun and a radar , A detector of microwaves is an aerial and a use for microwaves is mobile phone signals

Question 22

What is a source , detector and use for Infrared?

Answer 22

A source is the sun , a detector of Infrared radiation is a photodiode or a Closed circuit device (CCD) and a use for Infrared is a tv remote

Question 23

What is a source , detector and use for Visible light?

Answer 23

A source for visible light is the Sun , a detector of visible light is Photofilm,the retina of the eye or a CCD and a use for visible light is to predict the weather

Question 24

What is a source , detector and use for Ultra violet light?

Answer 24

A source is the sun and tanning beds , a detector of Ultra violet light is fluorescent dye and a use for ultra violet light is bank note security and sterilise medical equipment

Question 25

What is a source, detector and use for X-Rays?

Answer 25

A source of x-rays are radon gas and cosmic rays , a detector of X-Rays is photofilm and a use for x-rays is to take an image/picture of a broken bone

Question 26

What is a source, detector and use for gamma rays?

Answer 26

A source is nuclear explosions and lightning , a detector or gamma rays is Photofilm of Geiger-Muller tube (GM Tube) and a use for gamma rays is radiotherapy

Question 27

IS it correct to say that the energy associated with the different forms of e-m Radiation is in direct proportion to the frequency?

Answer 27

Yes that is correct

Question 28

When does refraction occur?

Answer 28

Refraction occurs when light passes from one medium into another.

Question 29

How does the speed of the wave change during refraction?

Answer 29

when the light moves into a denser medium than it was in the speed of the wave slows down. So when the light wave moves from glass into air the speed of the light increases

Question 30

How does the wave change direction during refraction?

Answer 30

when moving from air to glass the light changes direction slightly towards the normal when moving from glass to air the light changes direction slightly away from the normal

Question 31

What is the "Normal" ?

Answer 31

The Normal is an imaginary line drawn perpendicular to the boundary between the two materials

Question 32

What is the "Angle of Incidence"?

Answer 32

The angle of incidence is the angle between the Incident ray (Before it is refracted i.e before it changes medium) and the normal

Question 33

What is the "Angle of Refraction"?

Answer 33

The Angle of Refraction is the angle between the refracted ray ( after the change of medium) and the normal

Question 34

How do you identify the Angle of Incidence in diagrams?

Answer 34

The angle of Incidence is the angle before the change in medium

Question 35

How do you identify the angle of refraction in diagrams?

Answer 35

The angle of refraction is the angle after the change in medium

Question 36

How do you identify the "Normal" in diagrams?

Answer 36

The line that is perpendicular to the refraction