(a) Interpretation: The maximum kinetic energy of an ejected photoelectron from cesium when irradiated by 520 nm light should be calculated. Concept introduction: Data given: Longest wavelength of radiation needed to eject photoelectrons from cesium = λ min = 660 nm Formulae to use: Energy involved in photoelectric effect is expressed as, E λ = KE m + ω E λ = energy of the incident radiation KE m = kinetic energy of the ejected electrons ω = work function (minimum energy needed to eject the electrons) E = h ν Where, E = energy of light h = Plank’s constant = 6.6254 × 10 − 34 Js ν = frequency of light For air or vacuum, ν = c λ Where, c = velocity of light in vacuum (3.00 × 10 8 m/s ) λ = wavelength of light

BuyFind

Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213
BuyFind

Principles of Instrumental Analysis

7th Edition
Douglas A. Skoog + 2 others
Publisher: Cengage Learning
ISBN: 9781305577213

Solutions

Chapter 6, Problem 6.9QAP
Interpretation Introduction

(a)

Interpretation:

The maximum kinetic energy of an ejected photoelectron from cesium when irradiated by 520 nm light should be calculated.

Concept introduction:

Data given:

Longest wavelength of radiation needed to eject photoelectrons from cesium = λmin=660 nm

Formulae to use:

Energy involved in photoelectric effect is expressed as,

Eλ = KEm+ω

Eλ= energy of the incident radiation

KEm = kinetic energy of the ejected electrons

ω= work function (minimum energy needed to eject the electrons)

E = hν

Where,

E = energy of light

h = Plank’s constant = 6.6254×1034 Js

ν = frequency of light

For air or vacuum,

ν=cλ

Where,

c = velocity of light in vacuum (3.00 ×108 m/s )

λ = wavelength of light

Interpretation Introduction

(b)

Interpretation:

Velocity of the photoelectrons ejected when cesium is irradiated with 520 nm radiation should be calculated.

Concept introduction:

Data:

Rest mass of an electron =9.11×1031 kg

Formulae to use:

 KEm=12mv2

KEm = kinetic energy of the ejected electrons

m = mass

v = velocity

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