Chapter 29, Problem 19PE

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

Chapter
Section

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

# Unreasonable Results(a) What is the binding energy of electrons to a material from which 4.00-eV electrons are ejected by 400-nm EM radiation? (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?

To determine

(a)

The binding energy of the electrons

Explanation

Given:

Wavelength of light =Î»=400Â nmÂ =Â 400Â Ã—Â 10âˆ’9Â m

Frequency of light =f

Binding energy of metal =BE=?

Binding energy =BE

Kinetic energy of ejected electrons =KEÂ =Â 4Â eV

Formula Used:

Frequency is given as

â€ƒâ€ƒf=cÎ»

Energy of light is given as

â€ƒâ€ƒE=hf

Kinetic energy of the ejected electrons is given as

â€ƒâ€ƒKE=hfâˆ’BE

Calculation:

Frequency is given as

â€ƒâ€ƒf=cÎ»

Inserting the values

â€ƒâ€ƒf=(3Â &#

To determine

(b)

What is unreasonable about the result in part (a)

To determine

(c)

Which assumption is unreasonable or inconsistent

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