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Physics > Waves Light > Flashcards

Waves Light Flashcards

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1
Q

What is the speed of light in the vacuum of space and give scientific notation

A

300 000 000 m/s

3x10*8

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2
Q

What is white light

A

Combination of all the colours in the spectrum

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3
Q

What are all the different colours in a spectrum

A

Red orange yellow green blue indigo violet

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4
Q

The whistle light splits into 7 what is this called and explain

A

Called dispersion

All the colours refRACt at different angles so a prism reveals all the spectrum colours.

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5
Q

What is refRACtion

A

The bending of light when it passes from one medium to another.

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6
Q

Why do different mediums cause refraction

A

They have different optical densities.

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7
Q

Why can refraction be dangerous

A

Apparent depth vs real depth

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8
Q

What is the law of reflection of light

A

The angle of incidence (i)= angle of reflection (r)

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9
Q

Why is ambulance written weird
Called
Explain

A

Laterally inverted so that readable in car mirror

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10
Q

What happens to light through glass/ water

A

Speed of it decreases because they’re denser

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11
Q

Speed of light through glass

A

2x10*8m/s

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12
Q

What is a light year

A

Distance that light can travel at normal speed for a year

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13
Q

What is light?

A

Transverse wave+particle/photon

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14
Q

What does light travel in

A

Straight lines

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15
Q

What does not radiate its own light
Name
Eg

A

Illuminated objects,they reflect

MOON house flowers

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16
Q

What emits its own light?

A

Luminous objects
Sun
Light bulb

17
Q

What is a shadow

A

Dark area that blocks light

18
Q

Reflected:
Absorbed:
Transmitted:

A

Light bounces off
Travels into
Through objects

19
Q

Explain how we see light

A

Enter through pupil, strikes retina, converted to electrical nerve impulses travel to brain by optic nerve

20
Q

Si unit for light intensity vector/scalar

A

Lux scalar

21
Q

Luminous activity in a direction

A

Candela vector

22
Q

What instrument used to mesure light intensity and what does it measure in

A

Light meter

Light hitting per second

23
Q

What is a pinhole camera

A

Closed chamber with small hole in one side which creates an image of outside space on the opposite side where translucent screen is placed

24
Q

Uses of reflection of light

A

Periscope
Optical fibre
Kaleidoscope
Endoscope

25
Q

True false light always travels in straight lines

A

True

26
Q

What is the speed of light in water

A

2.3x10*8m/s

Physics (7 decks)

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