second 13 questions (waves)

Question 1

What is the frequency of a wave?

Answer 1

The number of waves produced each second.

Question 2

What is the symbol for frequency?

Answer 2

f

Question 3

What is the unit for frequency?

Answer 3

Hertz

Question 4

What is the unit symbol for frequency?

Answer 4

Hz

Question 5

Can UV waves travel through a vacuum?

Answer 5

Yes

Question 6

Give two ways we can protect our skins from

UV damage

Answer 6

Wearing clothing that covers our skin.

Applying sunscreen

Question 7

How does UV light damage our skin cells?

Answer 7

It causes mutations in DNA

Question 8

State the names and percentages of the gases

that make up the Earth’s atmosphere

Answer 8

Nitrogen (78%), Oxygen (14%), Argon (1%), Carbon Dioxide (0.04%)

Question 9

Give two examples of the impacts of climate

change.

Answer 9

● Increase in extreme weather events
● Hotter global temperatures on average
● Melting ice caps
● Increasing sea level
● Extinction of plant and animal species
● Harder for humans to grow crops to eat

Question 10

What is climate change?

Answer 10

A long-term change in weather patterns.

Question 11

What is global warming?

Answer 11

the gradual increase in surface temperature of the Earth.

Question 12

What is the greenhouse effect?

Answer 12

when energy from the Sun is transferred to the thermal energy store

of gases in the Earth’s atmosphere.

Question 13

Name two greenhouse gases

Answer 13

Carbon Dioxide, Methane