CE Rev - Phys 2

A boy claps his hands 85 m from a cliff. Sound travels at 340 m/s. he will hear an echo after

• 0.25 s

• 0.5 s

• 2 s

• 4 s

A clear glass block is said to be

• luminous

• opaque

• translucent

• transparent

Two notes are played on a piano. The second note sounds louder than the first because it has

• a greater amplitude

• a greater pitch

• a greater frequency

• a greater wavelength

A wave that cannot travel from the Sun to the Earth is

• heat radiation

• light

• radio

• sound

Changing the frequency of a sound wave changes the

• amplitude

• loudness

• pitch

• speed of the sound

An example of a non-renewable energy source is

• coal

• the sea

• the Sun

• wind

Light shining through crystal glass can cause rainbow colours to appear. This effect is called

• absorption

• diffusion

• dispersion

• reflection

Compared with sound, light travels

• at the same speed

• more slowly

• much faster

• slightly faster

When a beam of red light travels from air into water, it bends. This is called

• diffraction

• dispersion

• reflection

• refraction

A guitar string makes a sound when it is plucked because it

• is kept tight

• is long

• is made of steel

• vibrates