Electromagnetic waves

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Question 25
Medium

An ultraviolet (UV) ray is a type of electromagnetic wave.

a.

Give one common use of ultraviolet radiation.

[1]
b.

An ultraviolet wave has a wavelength of 0.030.030.03 micrometres (μm\mu\text{m}μm). Which of the following values is equal to 0.030.030.03 micrometres?

  • 3×10−8 m3 \times 10^{-8}\text{ m}3×10−8 m
  • 3×10−7 m3 \times 10^{-7}\text{ m}3×10−7 m
  • 3×10−10 m3 \times 10^{-10}\text{ m}3×10−10 m
  • 3×10−9 m3 \times 10^{-9}\text{ m}3×10−9 m
[1]
c.

The speed of electromagnetic waves in a vacuum is 3.0×108 m/s3.0 \times 10^8\text{ m/s}3.0×108 m/s. Calculate the frequency of this ultraviolet wave. Use your wavelength conversion from Part (b).

[3]

Electromagnetic waves Questions

  1. GCSE
  2. /Physics
  3. /Electromagnetic waves