Defintions

Question 1

Amplitude

Answer 1

The measure is the displacement of a wave from its rest point, the higher the amplitude of a wave and he higher its energy.

Question 2

Crest

Answer 2

The crest of a wave is its highest point

Question 3

Diffraction

Answer 3

Diffraction is when a wave remains in the same medium, but bends around an object

Question 4

Electromagnetic Wave

Answer 4

Electromagnetic waves are waves that can travel through a vacuum. E.g. Light. They do not need a medium

Question 5

Frequency

Answer 5

The frequency of a wave is the number of times per second the wave cycles. The frequency is the inverse of a period.

Question 6

Interference

Answer 6

Interference is when one wave comes into contact with another wave

Question 7

Light wave

Answer 7

A light wave is a special type of electromagnetic wave that has a frequency in the light spectrum

Question 8

Longitudinal waves

Answer 8

A wave in which the vibration is in the same direction that the wave is travelling

Question 9

Medium

Answer 9

A medium is matter that a wave travels through. (Anything with particles) e.g. Solid, Liquid or Gas

Question 10

Transparent

Answer 10

Light passes through easily and objects can be seen clearly

Question 11

Translucent

Answer 11

Allows light to pass through but objects aren’t detailed, mixed up

Question 12

Opaque

Answer 12

Light can’t pass through and is either reflected or absorbed into the substance

Question 13

Regular Reflection

Answer 13

When light reflects off a very smooth surface such as a mirror or a window

Question 14

Diffuse reflection

Answer 14

When light reflects off a rough surface the light reflects in many direction ps and doesn’t form a clear image

Question 15

Refraction

Answer 15

Refraction is where light bends through different mediums

Question 16

Law of reflection

Answer 16

The law states that the angle of incidence and the angle of reflection are equal

Question 17

Lateral inversion

Answer 17

Image is identical to the object in every way except that it is reversed sideways

Question 18

Ray diagram

Answer 18

A ray diagram is a drawing of the light rays coming from a mirror and light source, with the reflections and labels

Question 19

Law of refraction

Answer 19

If a ray travels form a less dense medium to a denser medium it bends towards the medium. Or when a ray travels from a denser medium to a less dense medium it bends away from the normal

Question 20

Absolute zero

Answer 20

The lowest possible temperature; -273c

Question 21

Conduction

Answer 21

A method of heat transfer in which heat is passed through a solid object by the vibration of particles.

Question 22

Conductor

Answer 22

A substance that allows heat to flow through it

Question 23

Convection

Answer 23

A method of heat transfer where a gas or liquid flows. Where a less dense substance warms up and flows upwards then cools and falls.

Question 24

Insulator

Answer 24

A material that does not conduct heat

Question 25

Radiation

Answer 25

Movement of heat in a form of electromagnetic waves, results in how hot or cold an object is, e.g the heat from the sun on earth. Doesn’t need a medium to travel through unlike conduction and convection

Question 26

Temperature

Answer 26

A measure of the average kinetic energy of particles in a substance that results in how hot or cold the object is

Question 27

Heat

Answer 27

Heat is a form of kinetic energy measured in kilojoules

Question 28

SONAR

Answer 28

Sound, Navigation and Ranging

Question 29

Ultrasound

Answer 29

Higher than 20,000 Hz

Question 30

Infrasound

Answer 30

Lower than the human hearing range

Question 31

Infra and Ultra (light)

Answer 31

Infra - below visible light on the spectrum

Ultra - above visible light on the spectrum