A radio receiver detects radio waves with a frequency of 200 kHz200\ \text{kHz}200 kHz. The speed of radio waves is 3.0 × 108 m/s.
Which option gives the frequency of the alternating current induced in the receiving aerial and the wavelength of the radio waves?
Current frequency 400 kHz400\ \text{kHz}400 kHz, wavelength 1500 m1500\ \text{m}1500 m
Current frequency 200 kHz200\ \text{kHz}200 kHz, wavelength 1500 m1500\ \text{m}1500 m
Current frequency 200 kHz200\ \text{kHz}200 kHz, wavelength 1.5×106 m1.5 \times 10^{6}\ \text{m}1.5×106 m
Current frequency 0 Hz0\ \text{Hz}0 Hz, wavelength 1500 m1500\ \text{m}1500 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.