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All main topics / Physics 11-14 / Light

Section 2.1 Light (22 Cards)

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1
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Light is a form of energy. (True or False)
True.
2
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We see an object because our eyes are sensitive to . . . . . . . . . . .
light
3
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Name a spectrum that light is part of.
electromagnetic spectrum
4
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Light travels at . . . . . . . . . . m/s.
300,000,000 m/s
5
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Sound travels at . . . . . . . . . .  m/s.
Answer
6
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In a thunder storm do you hear thunder before you see lightning? (Yes or No)
No
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In a thunder storm why do you see lightning before you hear thunder?
You see lightning before you hear thunder because light travels much faster (300,000,000 m/s) so it reaches your eyes before the sound from the thunder (330 m/s) reaches your ears.
8
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Sound travels at 330 m/s. If you hear thunder 3 seconds after seeing the lighting, how far away is the thunder storm?
about 1km away (990 m)
9
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Light is a  . . . . . . . . . .  wave.
transverse wave
10
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Draw and label a transverse wave.
11
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An object that give off light is called . . . . . . . . . ?
luminous object
12
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Explain how you see an object?
an object reflects light into your eyes
13
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Why can't you see around corners?
because light travels in a straight line
14
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Movement of light in a straight line is referred to as . . . . . . . . . ?
rectilinear propagation
15
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Why can't you see through a brick wall?
because light cannot penetrate through a brick wall
16
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If you cannot see through an object we say the object is . . . . . . . . . .
opaque
17
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If you can see through an object we say the object is . . . . . . . . . .
transparent
18
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If an object allow some light to go through we say the object is . . . . . . . . . .
Translucent
19
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Which one of the following is a luminous object?
1) Comet
2) Sun
3) torch without batteries
Sun
20
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Which one of the following has a sharp and clean shadow?
1) umbra
2) penumbra
umbra
21
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Which one of the following has a fuzzy shadow?
1) umbra
2) penumbra
penumbra
22
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Why is the umbra image sharp and clear?
Answer
Flashcard set info:
Author: Lerato
Main topic: Physics 11-14
Topic: Light
School / Univ.: Montessori Academy and College
City: Pretoria
Published: 08.02.2015
 
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