Momentun And Waves

Question 1

Wave speed calculation

Answer 1

Wave speed= frequency (Hz) x Wavelength (meters)

Question 2

Wave length

Answer 2

The distance between any part of a wave, the next part where the wave starts to repeat itself .

Question 3

Frequency

Answer 3

The number of waves produced in 1 second

Question 4

Amplitude

Answer 4

Half the vertical crest to trough distance

Question 5

Time period

Answer 5

Time to make 1 wave and the time for 1 wave to travel 1 wavelength

Question 6

Crest

Answer 6

The highest wave point

Question 7

Trough

Answer 7

The lowest wave point

Question 8

Wave front

Answer 8

A line joining together similar points on a wave (e.g. Crest)

Question 9

Transverse wave

Answer 9

Structure- peaks and trough
Vibration- 90 degree direction to energy transfer
Vacuum- light can travel through
Material- can move in liquids, gases and solids
Density- constant density
Pressure- pressure is constant
Speed of wave- dependant on material it is travelling through

Question 10

Longitudinal wave

Answer 10

Structure- compressions and rare fractions
Vibration- parallel to direction of energy transfer
Vacuum- light cannot travel through
Material- can move through solids,liquids and gases
Density- changes density
Pressure- changes in pressure
Speed of wave- dependent on material it is travelling through

Question 11

Time period calculation

Answer 11

1/frequency (Hz)

Question 12

Practical (measuring waves in ripple tank)

Answer 12

Aim of the experiment- to measure the frequency, wavelength and speed of waves in a ripple tank
Method- measure the length of a number of waves then divide by the number of waves to record wavelength.
Danger- electrical components near water

Question 13

Order of the electromagnetic spectrum

Answer 13

Radio
Microwave
Infrared
Visiable
Ultraviolet
X-ray
Gamma Ray

Question 14

Radio waves dangers

Answer 14

RF radiation is absorbed, produces heat

Question 15

Microwave waves dangers

Answer 15

Exposure to high levels, can cause skin burns

Question 16

Infrared wave dangers

Answer 16

Skin burns

Question 17

Visiable wave dangers

Answer 17

Damages the network of optically sensitive nerves on the retina

Question 18

Ultraviolet wave dangers

Answer 18

Sunburn, cancer, blindness

Question 19

X-ray waves dangers

Answer 19

Risk of cancer

Question 20

Gamma ray waves

Answer 20

DNA damage, cancer,Kills cells

Question 21

Refraction

Answer 21

When waves change speed, wavelength and often directions as they move from one medium to another

Question 22

Transmit

Answer 22

When a substance allows wave or radiation to pass through

Question 23

Absorb

Answer 23

The transfer of energy from electromagnetic wave to the material

Question 24

Radio wave uses

Answer 24

Communication, broadcasting, satellite transmission

Question 25

Microwave waves uses

Answer 25

Cooking food, radar, mobile phone, satellite

Question 26

Infrared waves uses

Answer 26

Used for heaters, night vision

Question 27

Visiable waves uses

Answer 27

Photography, illumination, optical fibres

Question 28

Ultraviolet waves uses

Answer 28

Killing bacteria, creating fluorescent

Question 29

X-rays waves uses

Answer 29

Produces images of internal bones

Question 30

Gamma ray waves uses

Answer 30

Medicine (radio therapy), nuclear