Ch 9 Physical Science Test

The speed of a wave depends on the ________.

• medium.

• frequency.

• amplitude.

• wavelength.

What is an echo?

• A type of sound

• A reflection of sound

• A sound wave

• A noise

Which of the following best describes a wave?

• A static object

• A disturbance that transfers energy

• A type of particle

• A solid structure

Why do radio and us hearing noises changes because of hills, mountains and buildings?

• Sound waves are absorbed by obstacles

• Sound waves bend around obstacles

• Sound waves are reflected by obstacles

• Sound waves pass through obstacles

Fish seem closer to the surface than they truly are because of the phenomenon of:

• Reflection

• Refraction

• Diffraction

• Absorption

What is the unit for wave speed (v)?

• m/s

• km/h

• cm/s

• m/min

Refraction is the _______ __ ______ as it passes from one medium to another.

• Reflection of light

• Bending of light

• Absorption of light

• Scattering of light

All waves can be reflected.

• True

• False

Waves transfer energy from the disturbance to molecule to molecule by:

• moving molecules permanently from one place to another

• creating a temporary displacement in molecules

• changing the chemical structure of molecules

• increasing the temperature of molecules

The wavelength is?

• From one crest to next crest

• From one crest to troughs

• Heigth of wave

• Speed of a wave