Wave Motion

Question 1

What is a transverse wave?

Answer 1

Transverse waves are oscillations perpendicular to the source

Question 2

What is a longitudinal wave?

Answer 2

Oscillations run parallel to the source

Question 3

Phase difference of one cycle of a wave in degrees and radians

Answer 3

360 degrees or 2(pie)radians

Question 4

Anti phase difference (half a period) in degrees and radians

Answer 4

180 degrees and (pie) radians

Question 5

Phase difference of a quarter cycle in degrees and radians

Answer 5

90 degrees and (pie)/2 radians

Question 6

A bigger amplitude _____ the energy

Answer 6

Increases

Question 7

A smaller amplitude _____ the amplitude

Answer 7

Decreases

Question 8

The energy of a wave is calculated using gravitational potential energy which means that energy is directly proportional to the ______

Answer 8

(Amplitude)^2

Question 9

Intensity written equation

Answer 9

I = power / area

I = P / 4(pie)r^2

Question 10

inverse square applied to intensity

Answer 10

The wave intensity of a wave and the distance from the source follow an inverse square relationship

Question 11

Admit-phase

Answer 11

Completely put of phase by 180 degrees

Question 12

Example of a longitudinal wave

Answer 12

Sound waves

Question 13

Example of transverse waves

Answer 13

Electromagnetic waves

Question 14

Gamma rays - ( emitted by? Wavelength?)

Answer 14

~emitted by radioactive nuclei

~Range of wavelength < 10^-12

Question 15

X- rays ( emitted by? Wavelength?)

Answer 15

~emitted by high speed electrons decelerating

~wavelength range 10^-8 to 10^-12

Question 16

Ultra Violet ( emitted by? Wavelength?)

Answer 16

~emitted by electric arcs

~wavelength range (3*10^-7 to 10^-8)

Question 17

Visible light wave length range

Answer 17

Red (8 * 10^-7)

Blue (3 * 10-7)

Question 18

Infrared ( emitted by? Wavelength?)

Answer 18

~emitted by heat sources

~range (10^-3 to 10^-6)

Question 19

Microwave ( emitted by? Wavelength?)

Answer 19

~ (1 to 10^-3)

Question 20

Radio waves ( emitted by? Wavelength?)

Answer 20

~ 1 >

Question 21

Can longitudinal waves be polarised?

Answer 21

No

Question 22

Are radio waves polarised? If so why or why not?

Answer 22

Yes they are because transmitters oscillate vertically which produces a vertically

Question 23

What affects the direction of a polarised wave?

Answer 23

The direction of polarisation of the wave is the orientation of the waves electric field