552210
Description
Quiz by alex.examtime9373, updated more than 1 year ago
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Created by alex.examtime9373
over 10 years ago
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Question 1
Question
What is the mass of an electron?
Answer
-
I u
-
- 1 u
-
1/1840 u
-
1/1840 g
Question 2
Question
What unit is used to measure the energy of an electron?
Answer
-
Joules
-
Watts
-
Electronvolts
Question 3
Question
Thermionic emission is the emission of electrons from the surface of a hot metal.
Answer
- True
- False
Question 4
Question
What is the work function of a metal?
Answer
-
The minimum energy needed to remove an electron from the surface of a metal.
-
The maximum limit for energy needed to remove an electron from the surface of a metal.
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The minimum frequency required to produce photoelectric emission
Question 5
Question
What phenomenon is the cathode ray tube based on?
Answer
-
Photoelectric effect
-
Thermionic emission
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X-rays
Question 6
Question
X-rays are electromagnetic radiation of extremely long wavelength.
Answer
- True
- False
Question 7
Question
Which of the following is not a component of an X-ray tube?
Answer
-
Cathode & anode
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Filament
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Tungsten target
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Fluorescent screen
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Vacuum
Question 8
Question
Calculate the energy of a photon of light of frequency 8 x 10^14
Planck's constant = 6.6 x 10^-34 J s
Answer
-
5.28 × 10^-19
-
1.21 x 10^48
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5.28 × 10^19
Question 9
Question
What is the charge of a proton?
Answer
-
Neutral
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Positive
-
Negative
Question 10
Question
In a cathode ray tube, where does thermionic emission occur?
Answer
-
At the cathode
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At the anode
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Along the filament
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Across the fluorescent screen
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