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Question: 

An EM wave has a wavelength of 720 nm. What is its frequency, and how would we classify it?

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$4.2 \times 10^{14} \textrm{ Hz. This is visible red light}$

Giancoli 7th Edition, Chapter 22, Problem 10

(0:35)

Chapter 22, Problem 10 is solved.

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