The electromagnetic spectrum

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Question 6

Medium

Four different electromagnetic radiations, $S$ , $Q$ , $R$ , and $S$ , are detected from a cosmic source:

Radiation $P\,$ consists of photons with energy 1.2 × 10^-15 J.
Radiation $Q\,$ has a frequency of 4.5 × 10¹¹ Hz.
Radiation $S\,$ consists of photons with energy $eV2.5\text{ eV}$ .
Radiation $P$ has a wavelength of 1.8 × 10^-8 m.

Which of these radiations has the longest wavelength in a vacuum?

Radiation $P$

Radiation $Q$

Radiation $R$

Radiation $S$

The electromagnetic spectrum Questions

GCSE
Physics
The electromagnetic spectrum