Skip to content

Course home

Electromagnetic spectrum

Electromagnetic spectrum

EasyMedium
1234567891011121314
Question 2
a.

Identify two of the following options that apply to an infrasound wave travelling in air:

  • frequency 15 Hz15\text{ Hz}15 Hz
  • frequency 1500 Hz1500\text{ Hz}1500 Hz
  • frequency 150 kHz150\text{ kHz}150 kHz
  • longitudinal
  • transverse
  • speed 3.4 m/s3.4\text{ m/s}3.4 m/s
  • speed 3.4×104 m/s3.4 \times 10^4\text{ m/s}3.4×104 m/s
  • speed 3.4×108 m/s3.4 \times 10^8\text{ m/s}3.4×108 m/s
[2]
b.

Calculate the wavelength in a vacuum of gamma rays of frequency 2.5×1020 Hz2.5 \times 10^{20}\text{ Hz}2.5×1020 Hz.

[2]
c.

A radiologist performs a chest X-ray on a patient. Explain why it is safe for the patient to undergo this brief procedure, but the radiologist must stand behind a protective lead screen or in another room during the exposure.

[3]
d.

State, with a reason, why ultraviolet (UV) sterilising chambers are designed with a safety mechanism that automatically turns off the UV light when the door is opened.

[2]
Markscheme

Electromagnetic spectrum Questions

  1. IGCSE
  2. /Physics
  3. /Electromagnetic spectrum

198 exam-style questions on CIE IGCSE Physics Electromagnetic spectrum, covering Electromagnetic spectrum. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank