13 Electromagnetic Spectrum 2021N

Radiation from which part of the electromagnetic spectrum is used in the remote controller for a television?

• infrared waves

• microwaves

• radio waves

• ultraviolet waves

Two rays of light are different colours. Which row is correct?

Visible light, X-rays and microwaves are all components of the electromagnetic spectrum. Which statement about the waves is correct?

• In a vacuum, microwaves travel faster than visible light and have a shorter wavelength.

• In a vacuum, microwaves travel at the same speed as visible light and have a shorter wavelength.

• In a vacuum, X-rays travel faster than visible light and have a shorter wavelength.

• In a vacuum, X-rays travel at the same speed as visible light and have a shorter wavelength.

Which radiation has a higher frequency than red light?

• ultraviolet

• radio waves

• microwaves

• infrared

The Sun emits infrared radiation and light. Light from the Sun reaches the Earth in 8 minutes. Which row gives correct information about the infrared radiation?

Which list shows regions of the electromagnetic spectrum in order of increasing frequency?

• X-ray → ultraviolet → visible light → infrared

• X-ray → infrared → visible light → ultraviolet

• infrared → visible light → ultraviolet → X-ray

• ultraviolet → visible light → infrared → X-ray

Which statement about electromagnetic waves is not correct?

• They travel at 3 × 10⁸ m/s in a vacuum.

• They transfer energy.

• They travel at 340 m/s in air.

• They are transverse waves.