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Chemistry & Chemical Reactivity

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

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

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

Which has the longer wavelength, visible light or ultraviolet light? The higher frequency? The higher energy per photon?

Interpretation Introduction

Interpretation: Among ultraviolet radiation and visible light, the radiation having longer wavelength, higher frequency and higher energy per photon 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.
  • Ultraviolet radiation lies between 200nm to 400nm whereas visible light is in between 400nm and 700nm.
  • Planck’s equation,

    E=where, 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
  • Ultraviolet radiation lies between 200nm to 400nm whereas visible light is in between 400nm and 700nm. This indicates that visible light has longer wavelength than ultraviolet radiation.
  • According to the relation between wavelength and frequency,ν=cλ since the frequency of the light is inversely proportional to its wavelength, the radiation that having least wavelength has the higher frequency

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