Electromagnetic spectrum and dispersion of light

Question 1 of 10

The order of the visible spectrum is remembered by the word ___.

Question 2 of 10

The electromagnetic waves with the longest wavelength are

Question 3 of 10

An electromagnetic wave has a frequency of 3 × 10⁹ Hz. Find its wavelength. (c = 3 × 10⁸ m/s)

Question 4 of 10

The electromagnetic waves used to sterilise surgical instruments and to treat cancer are ___ rays.

Question 5 of 10

A pure spectrum is obtained by

Question 6 of 10

X-rays are used in hospitals to

Question 7 of 10

Red light and green light mixed together give

Question 8 of 10

Infrared radiation is used in

Question 9 of 10

The primary colours of light are

Question 10 of 10

The electromagnetic waves used in mobile phone networks are ___.