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5.2 The electromagnetic spectrum

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Question 29
H

A TV remote control emits infrared. A person cannot see the infrared beam, but the camera on a mobile phone can show it on the screen.

Which statement explains this?

[1]
A

Infrared travels faster than light, so the eye cannot respond to it in time

B

Infrared wavelengths are shorter than 400 nm400\ \text{nm}400 nm, so only the camera detects them

C

Infrared is reflected by the front of the eye, so it never reaches the retina

D

Infrared wavelengths are longer than the eye can detect, but the camera responds to them

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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