Concept explainers
The number of photons needed if UV light is used.
Answer to Problem 36AAP
The number of photons needed if UV light is used is
The number of photons needed if visible light is used is
The number of photons needed if infrared light is used is
The energy of the UV light is greater when compared to other electromagnetic radiations.
Explanation of Solution
Write the expression to calculate energy of the electromagnetic radiation
Here, Planck's constant is
Write the expression to calculate number of photons needed
Here, input energy is
Conclusion:
The values of Planck constant and speed of light are
For UV light:
It is given that the wavelength of UV light is
Substitute
Substitute
Thus, the number of photons needed if UV light is used is
For visible light:
It is given that the wavelength of visible light is
Substitute
Substitute
Thus, the number of photons needed if visible light is used is
For infrared light:
It is given that the wavelength of infrared light is
Substitute
Substitute
Thus, the number of photons needed if infrared light is used is
The important conclusion is that the energy of the UV light is greater when compared to other electromagnetic radiations.
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Chapter 2 Solutions
Foundations of Materials Science and Engineering
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