P1.3 Light

What do sources of light do?

• Refract light
• Absorb light
• Reflect light
• Emit light

What is an object that gives out light said to be?

• Opaque
• Translucent
• Luminous
• Transparent

What word describes materials that transmit most light?

• Luminous
• Opaque
• Translucent
• Transparent

What objects allow some light to pass through but it is scattered so you can't see clearly?

• Translucent
• Luminous
• Emitter
• Non-luminous

What term describes materials that do not transmit light?

• Non-luminous
• Transparent
• Opaque
• Translucent

How does light travel?

• As particles in bent lines
• As particles in straight lines
• As waves in straight lines
• As waves in bent lines

What can light travel through?

• Solids, liquids, gases and vacuums
• Solids, liquids and gases
• Liquids, gases and vacuums
• Solids, liquids and vacuums

What is the speed of light?

• 300 km/s
• 300,000 m/s
• 300 m/s
• 300,000 km/s

What is a light-year?

• The time it takes light to reach Earth
• A year where the Sun does not set
• The distance light travels in a year
• The average speed of light in a year

Which of the following is not a source of light?

• A fire
• A firefly
• The moon
• A light bulb