Chapter 6, Problem 66GQ

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Chapter
Section

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

# The most prominent line in the emission spectrum of chromium is found at 425.4 nm. Other lines in the chromium spectrum are found at 357.9 nm, 359.3 nm, 360.5 nm, 427.5 nm, 429.0 nm, and 520.8 nm. (a) Which of these lines represents the most energetic light? (b) What color is light of wavelength 425.4 nm?

(a)

Interpretation Introduction

Interpretation: The most energetic line among the given lines in the emission spectrum of chromium has to be identified.

Concept introduction:

• Planck’s equation,

E==hcλwhere, E=energyh=Planck'sconstantν=frequency

The energy increases as the wavelength of the light decrease. Also the energy increases as the frequency of the light increases.

• The frequency of the light is inversely proportional to its wavelength.

ν=cλwhere, c=speedoflightν=frequencyλ=wavelength

Explanation

Emission spectrum of chromium has five lines in 357.9â€‰nm, 359.3â€‰nm, 360.5â€‰nm, 425.4â€‰nm, 427.5â€‰nm, 429.0â€‰nm and 520.8â€‰nm where 425.4â€‰nm is prominent

(b)

Interpretation Introduction

Interpretation: The colour of line having wavelength 425.4nm has to be identified.

Concept introduction:

• Electromagnetic radiations are a type of energy surrounding us. They are of different types like radio waves, IR, UV, X-ray etc.
• Visible light lies in the wavelength of 400nm to 700nm

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