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5.2 The electromagnetic spectrum

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Question 10
H

A microwave oven uses microwaves with a frequency of 2.45 GHz2.45\ \text{GHz}2.45 GHz.

The speed of microwaves is 3.0 × 108 m/s.

a.

Calculate the wavelength of the microwaves.

Give your answer in cm\text{cm}cm to 2 significant figures.

[3]
b.

The microwaves are produced by a device called a magnetron.

Explain how energy is transferred from the magnetron to the food.

[2]
c.

Mobile phone networks also use microwaves. Some people are worried that these microwaves are as hazardous as ultraviolet radiation.

Explain why microwaves are less hazardous to the body than ultraviolet radiation.

[2]
Markscheme

5.2 The electromagnetic spectrum Questions

  1. GCSE
  2. /Physics
  3. /5.2 The electromagnetic spectrum

48 exam-style questions on OCR GCSE Physics 5.2 The electromagnetic spectrum, covering 5.2.1 Electromagnetic waves in space, 5.2.2 Energy transfer by electromagnetic waves, 5.2.3 Frequency and wavelength across the spectrum, 5.2.4 Groups of the electromagnetic spectrum, 5.2.5 Visible light and the limits of human sight, 5.2.6 Light as an electromagnetic wave, 5.2.7 Uses of electromagnetic waves, 5.2.8 Hazards of ultraviolet, X-rays and gamma rays, 5.2.9 Ultrasound and imaging inside the body, and 5.2.10 Radio waves and oscillating circuits. Each one has a worked solution and a mark scheme showing where the marks go.

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