Physics- Waves

Question 0

Speed (wavelength)

Answer 0

V = f x wavelength

Question 1

Frequency

Answer 1

F = 1/T

Question 2

Refractive index

Answer 2

n = sin i/sin r

Question 3

Critical angle

Answer 3

Sin C = 1/n

Question 4

Light and electromagnetic waves are ???

Answer 4

TRANSVERSE WAVES

Question 5

Examples of TRANSVERSE WAVES

Answer 5

Light
EM waves
Slinky spring wiggled up and down
Ripples on water

Question 6

Sound waves are ???

Answer 6

LONGITUDINAL WAVES

Question 7

Examples of LONGITUDINAL WAVES

Answer 7

Sound
Shock waves
Slinky spring pushed on one end

Question 8

In transverse waves the vibrations are……

Answer 8

90 degrees to the direction of energy

Question 9

Longitudinal waves the vibrations are…..

Answer 9

Along the same direction as energy is transferred

Question 10

EM Waves longest wavelength to shortest wavelength

Which has highest / lowest frequency???

Answer 10

Radio waves, microwaves, infra red, visible light, ultra violet, x Rays, gamma rays

Question 11

VISIBLE LIGHT shortest wavelength colour??
Longest wavelength colour??

Frequency?

Answer 11

RED has longest wavelength, lowest frequency

VIOLET has shortest wavelength, highest frequency

Question 12

Uses of RADIOWAVES

Answer 12

Communications

Radio broadcasting

Question 13

Uses of MICROWAVES

Answer 13

Satellite communication

Cooking - microwaves absorbed by water molecules in food

Question 14

Uses of INFRARED

Answer 14

Heating

Monitor temperature

Question 15

Uses of VISIBLE LIGHT

Answer 15

Can travel through optical fibres - used for telephone and broadband internet cables

Photography

Question 16

Uses of ULTRAVIOLET

Answer 16

Fluorescent lamps

Question 17

Uses of X-RAYS

Answer 17

See inside things - internal structure of objects

Question 18

Uses of GAMMA RAYS

Answer 18

Sterilising medical equipment

Sterilising food

Question 19

Danger of MICROWAVES and protection?

Answer 19

Can heat human body tissue

Needs shielding to prevent from reaching user

Question 20

Danger of INFRARED and protection?

Answer 20

Too much infrared exposed to skin- skin burning

Wear insulating materials to reduce amt reaching skin

Question 21

Danger of ULTRAVIOLET and protection?

Answer 21

Damage surface cells
Blindness
Cell mutation or destruction and cancer

Wear sunscreen
Stay out of strong sunlight

Question 22

Danger of GAMMA and protection?

Answer 22

(Highest frequency so most harmful - carry most energy)

Cause cell mutation and destruction -> tissue damage or cancer

Exposed for short time only, sources kept in lead-lined boxes

Question 23

Law of reflection ?

Answer 23

Angle of incidence = angle of reflection