Lesson T4.2.1
T4.2.1 Light waves and the speed of light Quiz: KS3 Physics, Unit 4
20 questions
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Lesson T4.2.1, Light waves and the speed of light: 20 multiple choice questions for the KS3 Physics (National Curriculum), Unit 4: Waves, written with Revision Ninja.
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The 20 questions
-
What is the approximate speed of light in a vacuum?
- 3 000 m/s
- 3 000 000 000 m/s
- 300 000 000 m/s
- 330 m/s
-
What can light waves travel through that sound waves cannot?
- Air
- Glass
- A vacuum
- Water
-
Which wave property is shared by both light and water waves?
- Acoustic pressure
- Need for a medium
- Longitudinal motion
- Refraction
-
Roughly how long does it take for sunlight to reach Earth?
- 1 day
- 1 hour
- 8 minutes 20 seconds
- 1 second
-
What does a light-year measure?
- Speed
- Brightness
- Distance
- Time
-
Which common medium slows down light more than air?
- Glass
- Empty void
- Outer space
- Vacuum
-
Why does starlight take years to reach Earth?
- Vast distance
- Slow wave speed
- Heavy particles
- Magnetic drag
-
How long does light take to travel 1.5 × 10¹¹ m in a vacuum?
- 500 seconds
- 50 seconds
- 300 seconds
- 1500 seconds
-
How does the speed of light in air compare to a vacuum?
- Much slower
- Zero
- Twice as fast
- Almost the same
-
What type of wave is visible light?
- Longitudinal mechanical
- Transverse sound
- Longitudinal electromagnetic
- Transverse electromagnetic
-
How does starlight travel through space to reach our eyes?
- Through a vacuum
- Via optical fibres
- Through the air
- Using sound waves
-
What happens to the speed of light as it enters glass?
- It speeds up
- It stops entirely
- It slows down
- It stays constant
-
Which medium allows light to travel at the maximum possible speed?
- Air
- Vacuum
- Water
- Glass
-
What type of wave is an electromagnetic wave?
- Transverse wave
- Sound wave
- Mechanical wave
- Longitudinal wave
-
What distance does light travel in a vacuum in 2 seconds?
- 6 × 10⁸ m
- 1.5 × 10⁸ m
- 3 × 10⁸ m
- 9 × 10⁸ m
-
Which phenomenon demonstrates light transferring energy to a surface?
- Gravity pulling down
- Sunlight warming surfaces
- Sound echoing back
- Magnets attracting iron
-
What observation proves that light does not need air to travel?
- Sunlight reaching Earth
- Wind blowing trees
- Stars sounding loud
- Echoes in caves
-
What unit is typically used for measuring enormous distances between stars?
- Light year
- Kilometre
- Metre
- Astronomical mile
-
How long does light take to travel 300,000 km in a vacuum?
- 2 seconds
- 300 seconds
- 1 second
- 0.5 seconds
-
Why does a lightning flash appear before the thunder is heard?
- Sound travels faster
- Light travels faster
- Sound is heavier
- Light is louder
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