The longest possible wavelength that can ionize a cesium atom and the region in which this radiation belongs to has to be determined. Concept introduction: Electromagnetic radiations are a type of energy surrounding us. They are of different types like radio waves, IR, UV, X-ray etc. The wavelength of visible light lies between 400 nm to 700 nm Photoelectric effect: electrons get ejected if a ray of light hits on the surface of metal when the light has adequately high frequency. Planck’s equation, E = hν where, E = energy h = Planck's constant ν = 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 = c λ where, c = speed of light ν = frequency λ = wavelength

BuyFind

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
BuyFind

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

Solutions

Chapter 6, Problem 11PS
Interpretation Introduction

Interpretation:

The longest possible wavelength that can ionize a cesium atom and the region in which this radiation belongs to has to be determined.

Concept introduction:

  • Electromagnetic radiations are a type of energy surrounding us. They are of different types like radio waves, IR, UV, X-ray etc.
  • The wavelength of visible light lies between 400nm to 700nm
  • Photoelectric effect: electrons get ejected if a ray of light hits on the surface of metal when the light has adequately high frequency.
  • 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

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