3.3.1.2 Longitudinal + transverse waves

Which row correctly shows electromagnetic radiations in order of decreasing wavelength?

• gamma > ultraviolet > microwave

• ultraviolet > gamma > microwave

• microwave > ultraviolet > gamma

• gamma > microwave > ultraviolet

Which statement is correct about the properties of an unpolarised electromagnetic wave as it passes through a polariser?

• The wave remains unchanged.

• The wave does not pass through the polariser.

• The wave’s electric field oscillates along the direction of travel.

• The intensity of the wave is reduced.

The graph shows how the vertical height of a travelling wave varies with distance along the path of the wave.

The speed of the wave is 20 cm s–1.

is the period of the wave?

• 10.0 s

• 5.0 s

• 0.2 s

• 0.1 s

Which statement is not correct for ultrasound and X-rays?

• Both can be refracted

• Both can be diffracted

• Both can be polarised

• Both can be reflected

A stationary wave is set up on a stretched string of length l and diameter d.

Another stationary wave is also set up on a second string made from the same material and with the same tension as the first.

What length and diameter are required for the second string so that both strings have the same first-harmonic frequency?

• A

• B

• C

• D

What is the correct order of increasing photon energy in the electromagnetic spectrum?

1 is least energy, 4 is greatest energy.

• A

• B

• C

• D

Which of the following waves cannot be polarised?

• radio

• ultrasonic

• microwave

• ultraviolet

Which one of the following provides direct experimental evidence that light is a transverse wave motion rather than a longitudinal wave motion?

• Two light waves that are coherent can be made to interfere.

• Light can be diffracted.

• Light can be polarised.

• The intensity of light from a point source falls off inversely as the square of the distance from the source.

The sound quality of a portable radio is improved by adjusting the orientation of the aerial.

Which statement is a correct explanation of this improvement?

• The radio waves from the transmitter are polarised.

• The radio waves from the transmitter are unpolarised.

• The radio waves become polarised as a result of adjusting the aerial.

• The radio waves become unpolarised as a result of adjusting the aerial.

By approximately how many times is the wavelength of audible sound waves greater than the wavelength of light waves?

• 10²

• 10⁶

• 10¹⁰

• 10¹⁴