Y9Student Sound and Light Quiz 1

What is the speed of light?

• 299,700 kilometres per hour

• 300,000 km per second

• 300 metres per second

• 343 m/s

What is the speed of sound in dry air at 20 degrees C?

• 343 m/s

• 702 m/s

• 1,000 km / hr

• 220 m/s

If sound travels at 300,000 km/s, and it takes 8.3 minutes to get to Earth, how far away is the sun?

• 152.05 million km

• 1 million miles

• 1 light year

• 52,000 kilometres

Which type of wave has the longest wavelength?

• Infra-red

• radio waves

• radar waves

• gamma ray

The engineering units of frequency is

• Hertz

• Centimeters

• Amps

• Millimetres

What is the name of the area of full shadow in a solar eclipse?

• Shade

• Penumbra

• Umbra

• Dark spot

No object can travel faster than the speed of light

• True

• False

• Sometimes true

• Sometimes false

What form of energy can travel the fastest?

• light

• sound

• gravitational

• electrical

Which one is never a source of light?

• a mirror

• fluorescent paint

• jellyfish

• firefly

What percent of the universe can we see from Earth?

• 7%

• 4%

• 100%

• 0.1%