Concept explainers
(a)
Interpretation:
Laser that can be used has to be determined among a high-intensity red ruby laser and a low-intensity violet GaN laser.
Concept Introduction:
Wavelength and frequency are inversely proportional to each other and the relationship between wavelength and frequency can be given as,
Here,
Planck’s equation,
Here,
(a)
Explanation of Solution
- Calculate the energy of light from a high-intensity red ruby laser:
The
The frequency of light is
The energy per photon of light is calculated,
Substituting the values to the above equation,
The energy per photon is
- Calculate the energy of light from a low-intensity violet GaN laser:
Wavelength of light from a low-intensity violet GaN laser is
The frequency of light from a low-intensity violet GaN laser is calculated by using the equation,
The frequency of light is
The energy per photon of light is calculated,
Substituting the values to the above equation,
The energy per photon is
Comparing the values it is clear that the energy of light from a low-intensity violet GaN laser is higher than that of a high-intensity red ruby laser. Hence, a low-intensity violet GaN laser is used since it will give enough energy for ejecting an electron.
(b)
Interpretation:
Kinetic energy of the electrons emitted has to be calculated.
Concept Introduction:
Kinetic energy of one ejected electron can be calculated using the given formula,
Here,
(b)
Answer to Problem 1.31E
Kinetic energy of the electrons emitted is
Explanation of Solution
Given information is shown below,
Here, a low-intensity violet GaN laser is used
The frequency of light from a low-intensity violet GaN laser is calculated by using the equation,
The energy per photon of light is calculated,
The kinetic energy of the electrons emitted can be calculated as follows,
Therefore, kinetic energy of the electrons emitted is
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Chapter 1 Solutions
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