Topic 6 (Waves)

Question 1

Define wave

Answer 1

Transfer of energy from one place to another (Dont transfer any matter)

Question 2

What is Displacement

Answer 2

How far has a wave oscillated from the Equilibrium

Question 3

Distance (m)

Answer 3

How far has a wave moved from its starting point

Question 4

Wavelength

Answer 4

Distance of an entire Oscillation

Question 5

What is a chrest and a trough

Answer 5

Chrest - furtherest point of a oscillation

Trough - Lowest point of a oscillation

Question 6

What is a time period

Answer 6

Time taken to complete one oscillation

Question 7

Frequency equation

Answer 7

F (hz) = 1/T

Question 8

Wave speed

Answer 8

T = 1/F

Question 9

What is a Transverse wave

Answer 9

A wave that has oscillations that are perpendicular to the direction of energy transfer(equilibrium)

Question 10

examples of transverse waves

Answer 10

Electromagnetic waves, Light, Radio, S waves.

Question 11

What is an Longitudinal wave

Answer 11

A wave in which Oscillations are Parrel to the direction of Energy transfer(Equilibrium)

Question 12

Examples of Longitudinal waves

Answer 12

Sound, Seismic P wave

Question 13

All ways light can interact with a material

Answer 13

• Can be absorbed
• Can be Transmitted (Passes through)
• Can be Reflected

Question 14

Rule between angle of incidense and angle of reflection

Answer 14

Angle of incidence = Angle of Reflection

Question 15

Describe Specular Reflection

Answer 15

• Clear image
• All Normals are the same
• Flat boundary

Question 16

Describe Diffuse Scattered

Answer 16

• Does not create a clear image ( cannot see yourself)
• Boundry is bumpy
• Normals are different

Question 17

What is refraction?

Answer 17

Refraction is the bending of light as it passes from one medium to another due to a change in speed.

Question 18

Why does light bend when it enters a different medium?

Answer 18

Light bends because it changes speed when moving between materials with different densities.

Question 19

What happens when light moves from a less dense to a more dense medium?

Answer 19

It slows down and bends towards the normal.

Question 20

What happens when light moves from a more dense to a less dense medium?

Answer 20

It speeds up and bends away from the normal.

Question 21

What is the normal line?

Answer 21

An imaginary line perpendicular to the surface at the point where the light enters the new medium.

Question 22

What is the angle of incidence?

Answer 22

The angle between the incident ray and the normal.

Question 23

What is the angle of refraction?

Answer 23

The angle between the refracted ray and the normal.

Question 24

What happens if the wave enters at 90° to the surface?

Answer 24

The wave does not bend, but it still changes speed.

Question 25

Why does refraction occur?

Answer 25

Because waves change speed when moving between materials of different densities.

Question 26

What are electromagnetic waves?

Answer 26

Electromagnetic (EM) waves are transverse waves that transfer energy and can travel through a vacuum at the speed of light (3 x 10^8 m/s).

Question 27

What is the order of the electromagnetic spectrum?

Answer 27

Radio waves, Microwaves, Infrared, Visible light, Ultraviolet, X-rays, Gamma rays (Remember: Rabbits Make Incredible Very Unique Xmas Gifts).

Question 28

What are the uses of radio waves and microwaves?

Answer 28

Radio waves → Communication (TV, radio, mobile phones) Microwaves → Cooking (heating food), satellite communication (pass through the atmosphere)

Question 29

What are the uses of infrared and visible light?

Answer 29

Infrared (IR) → Heating (grills, toasters), night vision, remote controls Visible light → Seeing, cameras, fiber optic communication

Question 30

What are the uses of ultraviolet, X-rays, and gamma rays?

Answer 30

Ultraviolet (UV) → Sterilising, sunbeds, security marking X-rays → Medical imaging, airport security Gamma rays → Cancer treatment (radiotherapy), sterilising medical equipment