Unit 6 - Earth Physics

In which of the following, sound wave travels the fastest?

• Juice

• Metal

• Vacuum

• Nitrogen

The part of a sound wave where molecules are spread apart is called .........................

• diffraction

• absorption

• compression

• rarefaction

Which of these sound waves has the quietest volume?

• 1

• 2

• 3

• 4

When Mr. Tabbert yells his name in a cave, the sound reflects off the walls of the cave and travels back to his ears.  What is this called?

• frequency

• echo

• echolocation

• pitch

How do bats and other animals use echolocation to see?

• They make high pitch sounds that zap their prey.

• They make low pitch sounds that draw their prey to them.

• They make high pitch sounds that bounce off prey and back to them.

• None of the above

A meeting has to take place in a big conference hall. Which one of these materials will help to reduce echoes in the hall?

• Flat wood sheets

• Shiny metal sheets

• Large flat mirrors

• Soft thick curtains

Tim is playing guitar by plucking the strings. How do you think can he make the sound of guitar louder?

• Pluck the string with more force.

• Pluck the string with less force.

• Make the string tighter.

• Make the string looser.

How does increasing the amplitude of a sound wave affect the sound?

• It makes the sound louder.

• It makes the sound softer.

• It increases the frequency of the sound.

• It makes the sound travel faster.

Which layer of the Earth consists of solid iron and nickel in the centre?

• Crust

• Inner Core

• Outer Core

• Mantle

What do you call the supercontinent landmass formed million years ago?

• Pangaea

• Asia

• Pantallasa

• Eurasia