A mobile phone sends signals using microwaves with a frequency of 1.5 GHz1.5\ \text{GHz}1.5 GHz. The speed of the microwaves is 3.0 × 108 m/s.
Use the equation: wave speed=frequency×wavelength\text{wave speed} = \text{frequency} \times \text{wavelength}wave speed=frequency×wavelength
What is the wavelength of the microwaves?
2.0×102 m2.0 \times 10^{2}\ \text{m}2.0×102 m
2.0×10−1 m2.0 \times 10^{-1}\ \text{m}2.0×10−1 m
2.0×108 m2.0 \times 10^{8}\ \text{m}2.0×108 m
4.5×1017 m4.5 \times 10^{17}\ \text{m}4.5×1017 m
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.