
Concept explainers
Determine the speed of an electron being emitted by rubidium
(a)

Interpretation:
The speed of an electron that is being emitted by rubidium, when light of different wavelength is shined on the metal in vacuum is to be stated.
Concept introduction:
The emission of electrons when the light is shone upon a material is called the photoelectric effect. The electrons emitted by such a method are also known as photo-electrons. The process basically involves shining light of frequency
Answer to Problem 9.35E
The speed of an electron that is being emitted by rubidium, when light of different wavelength is shined on the metal in vacuum is
Explanation of Solution
The given value of work function
The formula to calculate the velocity of an electron is given below.
Where,
•
•
•
•
•
•
It is known that,
Therefore,
It is known that,
1nm
Therefore,
Rearrange equation (1) to calculate the value of velocity.
Substitute the values of work function
Therefore, the value of speed is
The speed of an electron that is being emitted by rubidium, when light of different wavelength is shined on the metal in vacuum is
(b)

Interpretation:
The speed of an electron that is being emitted by rubidium, when light of different wavelength is shined on the metal in vacuum is to be stated.
Concept introduction:
The emission of electrons or other free electrons when the light is shone upon a material is called the photoelectric effect. The electrons emitted by such a method are also known as photo-electrons. The process basically, involves shining light of frequency
Answer to Problem 9.35E
The speed of an electron that is being emitted by rubidium, when light of different wavelength is shined on the metal in vacuum is
Explanation of Solution
The given value of work function
The formula to calculate the velocity of an electron is given below.
Where,
•
•
•
•
•
•
It is known that,
1eV
Therefore,
It is known that,
1nm
Therefore,
Rearrange equation (2) to calculate the value of velocity.
Substitute the values of work function
Therefore, the value of speed is
The speed of an electron that is being emitted by rubidium, when light of different wavelength is shined on the metal in vacuum is
(c)

Interpretation:
The speed of an electron that is being emitted by rubidium, when light of different wavelength is shined on the metal in vacuum is to be stated.
Concept introduction:
The emission of electrons when the light is shone upon a material is called the photoelectric effect. The electrons emitted by such a method are also known as photo-electrons. The process basically involves shining light of frequency
Answer to Problem 9.35E
The speed of an electron that is being emitted by rubidium, when light of different wavelength is shined on the metal in vacuum is
Explanation of Solution
The given value of work function
The formula to calculate the velocity of an electron is given below.
Where,
•
•
•
•
•
It is known that,
1eV
Therefore,
It is known that,
1nm
Therefore,
Rearrange equation (3) to calculate the value of velocity.
Substitute the values of work function
Therefore, the value of speed is
The speed of an electron that is being emitted by rubidium, when light of different wavelength is shined on the metal in vacuum is
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Chapter 9 Solutions
Physical Chemistry
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