Classwork Grade 8

Front

What is the reason communication in space occurs by using radio waves?

Back

Sound needs a medium (like air) to be carried and space has no medium (it's a vacuum).

Front

Which wave has a greater frequency, A or B?

Back

Wave A has a greater frequency.

Front

What term is used to identify the distance between points C & G?

Back

Wavelength.

Front

What happens to light when it is refracted?

Back

Light bends.

Front

What is the definition of frequency?

Back

The number of waves that pass in a given amount of time.

Front

What is amplitude in wave terminology?

Back

The maximum extent of a wave's displacement from its rest position.

Front

What is the definition of wavelength?

Back

The distance between successive crests of a wave.

Front

What is the difference between reflection and refraction?

Back

Reflection is the bouncing back of light, while refraction is the bending of light as it passes from one medium to another.

Front

What is the formula for wave speed?

Back

Wave speed = frequency × wavelength.

Front

What is the relationship between frequency and wavelength?

Back

They are inversely related; as frequency increases, wavelength decreases.