EM waves

1 Which row shows the natures of light waves, sound waves and X-rays?

• A

• B

• C

• D

1 Visible light has a frequency of approximately 5.0 × 10¹⁴ Hz. M and N are two other types of electromagnetic radiation.

The frequency of M is 5.0 × 10⁶Hz.

The frequency of N is 5.0 × 10¹⁵Hz. Which types of radiation are M and N?

• M - radio waves , N - infra-red

• M - radio waves , N - ultraviolet

• M-ultravioletm N - X-rays

• M- X-rays, N - infra red

BThe diagram represents the electromagnetic spectrum.

Some regions have been labelled, and some labels are missing. Which region should be labelled as infra-red waves?

• A

• B

• C

• D

Which group contains only electromagnetic waves?

• light waves, radio waves, γ-rays

• light waves, radio waves, sound waves

• light waves, sound waves, γ-rays

• radio waves, sound waves, γ-rays

The diagram shows the electromagnetic spectrum.A word is missing from the label below the spectrum. Which word is missing?

• amplitude

• frequency

• speed

• wavelength

1 How do infra-red waves differ from ultraviolet waves?

• Infra-red waves are longitudinal.

• Infra-red waves have a lower speed in vacuo (in a vacuum).

• Infra-red waves have lower frequencies

• Infra-red waves have smaller wavelengths.

Which list shows electromagnetic waves in order of increasing frequency?

• visible light, X-rays, γ-rays

• visible light, γ-rays, X-rays

• X-rays, γ-rays, visible light

• γ-rays, X-rays, visible light

Which statement about ultraviolet waves is correct?

• They are used in television remote controllers.

• They can be detected by the human eye.

• They travel as longitudinal waves.

• They have the same speed in a vacuum as radio waves.

Which type of electromagnetic wave is used in airport security scanners?

• infra-red

• microwaves

• radio waves

• X-rays

An intruder alarm sensor detects that a human is warmer than his surroundings. Which type of electromagnetic wave does the sensor detect?

• infra-red

• radio

• ultraviolet

• visible light