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Science Year 9 Semester 2 > Heat, sound and light > Flashcards

Heat, sound and light Flashcards

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1
Q

Accommodation

A

The ability of the lens of the eye to change shape to focus on different distances

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2
Q

Angle of incidence

A

The angle that an incoming ray makes with the normal

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3
Q

Angle of reflection

A

The angle that a reflected ray makes with the normal

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4
Q

Angle of refraction

A

The angle that a refracted ray makes with the normal

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5
Q

Concave lens

A

A lens that curves inwards and can correct myopia

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6
Q

Conduction

A

A method of heat transfer in which heat is passed by vibration of particles

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7
Q

Conductor

A

A substance that allows heat to flow through it

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8
Q

Convection

A

Transfer f heat in a liquid or gas due to less dense, warmer matter rising and cooler matter falling

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9
Q

Convex lens

A

A lens that bulges outwards and can correct hyperopia

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10
Q

Critical angle

A

The angle of incidence of light that produces an angle of refraction of 90 degrees and total internal reflection can occur

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11
Q

Echo

A

A sound that is reflected and heard a second time

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12
Q

Frequency

A

The number of waves passing a point every second

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13
Q

Hertz (Hz)

A

Unit used to measure frequency

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14
Q

Incident ray

A

Incoming ray

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15
Q

Insulator

A

A material that does not conduct heat well

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16
Q

Lateral inversion

A

The sideways or left to right reversal of an image in a plane mirror

17
Q

Law of reflection

A

Light is reflected at the same angle that it is incident (i=r)

18
Q

Longitudinal wave

A

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

19
Q

Long sightedness (hyperopia)

A

The ability to see distant objects clearly and close objects appear blurry

20
Q

Luminous

A

An object that releases or emits light

21
Q

Normal

A

An imaginary line that is drawn at right angles to a surface that light is incident upon

22
Q

Plane mirror

A

A flat mirror

23
Q

Radiation

A

Movement of heat in the form of electromagnetic waves, which can travel through a vacuum

24
Q

Rarefaction

A

A region of low pressure in which particles are far apart

25
Q

Compression

A

A region of high pressure in which particles are close together

26
Q

Real image

A

An image formed when rays of light actually meet

27
Q

Reflected ray

A

Ray that bounces off

28
Q

Reflection

A

The bouncing of light off of something

29
Q

Refraction

A

The bending of light as it passes from one substance into another substance with a different refractive index

30
Q

Refractive index

A

A measure of how easily light travels through a substance

31
Q

Reverberation

A

Length of time a sound can be heard

32
Q

Short sightedness (myopia)

A

The ability to see close objects clearly and distant objects appear blurry

33
Q

Sound wave

A

Regions of high and low pressure originating from a vibrating object and transmitted through a medium

34
Q

Temperature

A

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

35
Q

Thermometer

A

An instrument used to measure temperature

36
Q

Total internal reflection

A

When light is completely reflected from the boundary of two substances. It occurs when the angle of incidence is greater than the critical angle.

37
Q

Transverse wave

A

A wave in which the vibration is at right angles to the direction the wave is travelling

38
Q

Virtual image

A

An image formed in which the rays of light do not actually meet, but only appear to meet at a point inside the mirror

39
Q

Wavelength

A

The distance from one peak of a wave to the next

Science Year 9 Semester 2 (5 decks)

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