Noise pollution

What is a Decibel (dB)?

• a unit for how long a thing is

• a unit for how loud a sound is

• a unit for how heavy a thing is

What is considered very loud for the human ears?

• 40dB

• 70dB

• 100dB

If you hear loud noises for 2 minutes, it is dangerous for your health.

• True

• False

If you hear loud noises for 8 hours non stop, it is dangerous for your health.

• True

• False

What is noise pollution?

• Dirty things in the air

• Unwanted sounds

• Dirty water in the river

Which one is not a cause of noise pollution?

• 
• 
• 
• 

How do we get affected by noise pollution? Choose 2.

• Our sleep gets disturbed

• Our music gets nicer

• Our ear drums get torn

• Our health gets better

How do whales communicate?

• Through a rock song

• Through a whale song

• Through an animal song

Whale songs are also used for echo sensing.

• True

• False

How does echo sensing work?

• A source gives out a sound and waits for the echo to come back.

• A source gives out echo and then wait for nothing to come back

• A source gives out music and the music changes when it comes back