Chapter 10 energy

Question 1

Law of Conservation Of Energy

Answer 1

Energy can’t be created or destroyed. Only transferred.

Question 2

Energy

Answer 2

Anything that can do work.

Question 3

Gravitational

Answer 3

Potential energy of an object elevated above the ground.

Question 4

Elastic

Answer 4

Energy stored by an elastic object that is stretched, such as a spring or rubber band.

Question 5

Chemical

Answer 5

Energy stored in chemicals that, when reacted together such as in burning reactions, release, heat, sound or light.

Question 6

Nuclear

Answer 6

Energy stored in the nuclear atoms that can release energy slowly, such as a nuclear reactor, or quickly, such as in a nuclear explosion.

Question 7

Electrical

Answer 7

Energy supplied to homes by powerlines and available to your appliances via power outlets in the home.

Question 8

Kinetic

Answer 8

Energy possessed by objects that are moving.

Question 9

Heat

Answer 9

Energy that causes objects to gain temperature.

Question 10

Light

Answer 10

Energy that may be released, for example, when an object is hot or by a nuclear reaction in a star.

Question 11

Sound

Answer 11

Energy carried by the air in a room and detected by the ear

Question 12

Efficiency

Answer 12

The amount of energy supplied to a device as useful energy.

Question 13

Conduction

Answer 13

Transfer of heat through collisions between particles.

Question 14

Insulator

Answer 14

A poor conductor of heat.

Question 15

Convection

Answer 15

Transfer of heat through the flow of particles.

Question 16

Radiation

Answer 16

A method of heat transfer that does not require particles to travel heat from one place to another.

Question 17

Radiant heat

Answer 17

Heat transferred by radiation, as from the sun to the earth.

Question 18

Reflected

Answer 18

Bounced off

Question 19

Transmitted

Answer 19

Light or sound passing through the air

Question 20

Absorbed

Answer 20

Taken in

Question 21

Deciduous

Answer 21

Describe plants or trees that lose their leaves during the autumn and winter seasons.

Question 22

Luminous

Answer 22

Releasing its own light

Question 23

Incandescent

Answer 23

Describes objects that produce light when they are hot.

Question 24

Bioluminescent

Answer 24

Describes living things that can produce light energy.

Question 25

Non-luminous

Answer 25

Describes object that can not produce their own light, but can be seen by reflected light.

Question 26

Scattered

Answer 26

Light sent in many directions by small particles within a substance.

Question 27

Visible spectrum

Answer 27

Describes the colours in a rainbow.

Question 28

Dispersion

Answer 28

Separation of the colours that make up white light.

Question 29

Electromagnetic radiation

Answer 29

The radiant energy and gamma rays released by magnetic or electric fields.

Question 30

Electromagnetic spectrum

Answer 30

Complete range of energy radiated as electric and magnetic fields.

Question 31

Radio waves

Answer 31

Low energy with a much lower frequency of visible light.

Question 32

Infra-red radiation

Answer 32

Invisible radiation that is felt as heat.

Question 33

Ultraviolet radiation

Answer 33

Invisible radiation similar to light expect with its with a higher frequency and carry's a bit more energy.

Question 34

X-Ray's

Answer 34

Scans on the human body checking for inner injuries.

Question 35

Gamma rays

Answer 35

High amounts of radiant energy produced during nuclear reactions.

Question 36

Rays

Answer 36

Narrow beams of light

Question 37

Concave

Answer 37

A lens that is curved inwards

Question 38

Convex

Answer 38

Refers to a lens that is curved outwards.

Question 39

Focal point

Answer 39

When light rays converge towards a point.

Question 40

Lateral inversion

Answer 40

Sideway reversal of how things look in a mirror.

Question 41

Refraction

Answer 41

Change in speed of direction as light passes from one substance into another.

Question 42

Normal

Answer 42

Line drawn to a surface at the point where a light Ray meets it.

Question 43

Image

Answer 43

Picture of an object.

Question 44

Vibrations

Answer 44

Repeated, fast, back and fourth movements.

Question 45

Compression

Answer 45

The process of pushing a material into itself.

Question 46

Rarefactions

Answer 46

The layers of air particles that are spread apart in sound waves.

Question 47

Sound waves

Answer 47

Vibrations of particles in the air

Question 48

Frequency

Answer 48

Number of vibrations on one second.

Question 49

Hertz

Answer 49

Unit of frequency, it's abbreviation is Hz. One hertz is equal to one vibration every second.

Question 50

Pitch

Answer 50

The highness or lowness of a sound.

Question 51

Wavelength

Answer 51

Distance between two neighbouring crests or troughs of a wave.

Question 52

Amplitude

Answer 52

Maximum distance that a particles moves away from its undisturbed position.

Question 53

Reverberation

Answer 53

Long-lasting sound caused by repeated reflection from hard surfaces.