## Chemistry: Principles and Practice (3rd Edition)

Published by Cengage Learning

# Chapter 7 - Electronic Structure - Questions and Exercises - Exercises: 7.21

#### Answer

Wavelength = $5.54\times10^{-7}m$ This is a visible light wavelength.

#### Work Step by Step

Speed of the light, c = $2.997925\times10^{8}$ $ms^{-1}$ Frequency, ν = $5.41\times10^{14}s^{-1}$ Wavelength, λ = c/ν = $\frac{2.997925\times10^{8}ms^{-1}}{5.41\times10^{14}s^{-1}}$ = $5.54\times10^{-7}m$. This is a characteristic visible light wavelength as the range of visible spectrum is from $4.0\times10^{-7}m$ to $7.5\times10^{-7}m$ (Refer Figure 7.4)

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