Light-REVISION

What term is used to describe a wave which causes particles to move at right angles to the direction of motion?

• mechanical

• transverse

• longitudinal

• electromagnetic

The number of waves produced every second is called the:

• frequency

• amplitude

• wavelength

• visible spectrum

In the image below, which piece of paper has a wave with the highest amplitude?

• A

• B

• C

• D

The type of material being utilised in the image below can be described as:

• Transparent

• translucent

• polarising

• opaque

An apple appears red because:

• molecules in the skin of the apple emit red light

• molecules in the skin of the apple only absorb red light

• molecules in the skin of the apple convert other wavelengths of light to red light

• molecules in the skin of the apple reflect red wavelengths and absorb all the others.

The missing word in the diagram below is:

• incident ray

• normal.

• angle of incidence.

• angle of reflection.

The angle of reflection is best described as the:

• incoming ray of light that hits the reflecting surface

• outgoing ray of light that is reflected off the surface.

• angle between the incident ray and the normal.

• angle between the reflected ray and the normal.

The object below is most likely to be a:

• concave lens

• convex lens

• concave mirror

• convex mirror

Complete the following sentence.

A car that appears red in colour, ____________ red wavelengths in the visible spectrum and _____________ the wavelengths of all the other colours.

• Absorbs; reflects

• Reflects; absorbs

• Reflects; diffuses

• Diffuses; reflects

All materials fall into three categories according to how much light they allow to pass through them. Which of these words is not one of those categories?

• Absorptive

• transparent

• translucent

• opaque