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Gcse Physics > Term 4 Test- Light and the electromagnetic spectrum > Flashcards

Term 4 Test- Light and the electromagnetic spectrum Flashcards

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1
Q

When does reflection occur?

A

A wave hits a boundary between two mediums and does not pass through, but instead stays in the original medium

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2
Q

What is the law of reflection?

A

Angle of incidence (i) = Angle of reflection (r)

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3
Q

When does refraction occur?

A

Refraction occurs when light passes a boundary between two different transparent media
At the boundary, the rays of light change direction because the light changes speed

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4
Q

When does total internal reflection occur?

A

The angle of incidence is greater than the critical angle and the incident material is denser than the second material

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5
Q

What is specular reflection?

A

Reflection from a smooth surface in a single direction

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6
Q

What is diffuse reflection?

A

Reflection from a rough surface causes scattering

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7
Q

If an object appears red what does this mean has happened?

A

Only red light has been reflected
All the other frequencies of visible light have been absorbed

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8
Q

What are the two types of lenses?

A

Converging and diverging

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9
Q

In ROYGBIV which of these has the longest wavelength

A

Red

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10
Q

In ROYGBIV which of these has the shortest wavelength

A

Violet

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11
Q

Describe a converging lens

A

Lenses that are thicker in the middle. A converging lens bend rays of light towards one another, bringing them to one point.c

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12
Q

Describe a diverging lens

A

Lenses that are thinner in the middle. A diverging lens bends rays of light away from each other.

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13
Q

What does the power of a lens mean?

A

The greater the power of the lens, the more light it bends

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14
Q

Is the power for a diverging lens positive or negative?

A

Negative

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15
Q

Is the power for a converging lens positive or negative?

A

Positive

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16
Q

Describe a real image

A

A real image is formed where light rays converge and are actually focused on a screen.

17
Q

Describe a virtual image

A

A virtual image is formed by light rays which appear to diverge from that point, but do not actually do so.

18
Q

What a properties of an electromagnetic wave?

A
  • They are all transverse
  • They travel at the same speed in a vacuum ( 3 x 10 to the power of 8 m/s)
  • Transfer energy
19
Q

List in the right order the electromagnetic spectrum

A

Radio waves, Micro waves, Infra red, Visible light, Ultra violet, X-rays, Gamma rays

20
Q

What waves are commonly used by satellites?

A

Microwaves and Radio waves

21
Q

What are problems of radiation with high energy?

A

Highly ionising and harmful to cells and tissues causing cancer.

22
Q

When EM waves interact with matter to they speed up or slow down

A

Slow down, therefore the denser the substance the slower the wave

23
Q

What different ways can EM waves move from one medium to another?

A

Transmitted, Absorbed, Reflected, Refracted

24
Q

What type of waves can be used by satellites?

A

Microwaves and Radio waves

25
Q

What are EM waves made up of?

A

EM waves are made up of oscillating electric and magnetic fields

26
Q

Name two things infrared radiation can be used for?

A
  • Monitor temperature
  • Transfer information
27
Q

Which type of EM wave has the highest frequency?

A

Gamma rays

28
Q

True or False
Changes in atoms can generate EM waves?

A

True

29
Q

What type of radiation is used in optical fibres?

A

Infrared radiation

30
Q

Name some side effects of X-rays

A

Could cause cancer/ cell mutations/ damage cells

31
Q

True or False
As an object’s temperature increases, the peak wavelength of the radiation it emits will become shorter.

A

True

32
Q

If an objects temperature is constant, what can be said about the average power emitted and absorbed by that object?

A

The average power emitted by the object will be equal to the average power absorbed by the object.

33
Q

True or False
Radiation from the sun can be absorbed by the Earth’s atmosphere

A

True

Gcse Physics (3 decks)

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