Physics Pre-test WAVES

What is a medium?

• An average

• An electromagnetic wave

• something energy can travel through

• a mirror

An opaque medium will:

• allow energy to pass completely through without any energy being lost or scattered

• not allow energy to pass through

• allow energy to completely pass through buy some of the energy will be lost or scattered

What is a wave?

• a repeating disturbance that travels through a medium

• a non-repeating disturbance that travels through ha medium

• a disturbance that cannot travel through a medium

• a medium that repeats itself

Which of these are characteristics of waves (choose as many as you think are right)?

• peaks

• frequency

• cycles

• spins

• all of the above

the difference between mechanical and electromagnetic waves is:

• nothing

• they have different wavelengths

• electromagnetic waves can travel through no medium (a vacuum)

• Mechanical waves can travel through no medium (a vacuum)

Which letter represents the peak of a wave?

• A

• B

• C

• D

Which letter represents the trough of a wave?

• A

• B

• C

• D

Which letter represents the amplitude of a wave?

• A

• B

• C

• D

The frequency of a wave is determined by:

• how high the peaks rise

• how many full cycles per unit time

• how low the troughs dip

• how long the wavelength travels

what is the measurement unit for frequency:

• m/s

• Watts

• metres

• Hertz