552210
Descrição
Quiz por alex.examtime9373, atualizado more than 1 year ago
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Criado por alex.examtime9373
quase 11 anos atrás
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Questão 1
Questão
What is the mass of an electron?
Responda
-
I u
-
- 1 u
-
1/1840 u
-
1/1840 g
Questão 2
Questão
What unit is used to measure the energy of an electron?
Responda
-
Joules
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Watts
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Electronvolts
Questão 3
Questão
Thermionic emission is the emission of electrons from the surface of a hot metal.
Responda
- True
- False
Questão 4
Questão
What is the work function of a metal?
Responda
-
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.
-
The minimum frequency required to produce photoelectric emission
Questão 5
Questão
What phenomenon is the cathode ray tube based on?
Responda
-
Photoelectric effect
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Thermionic emission
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X-rays
Questão 6
Questão
X-rays are electromagnetic radiation of extremely long wavelength.
Responda
- True
- False
Questão 7
Questão
Which of the following is not a component of an X-ray tube?
Responda
-
Cathode & anode
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Filament
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Tungsten target
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Fluorescent screen
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Vacuum
Questão 8
Questão
Calculate the energy of a photon of light of frequency 8 x 10^14
Planck's constant = 6.6 x 10^-34 J s
Responda
-
5.28 × 10^-19
-
1.21 x 10^48
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5.28 × 10^19
Questão 9
Questão
What is the charge of a proton?
Responda
-
Neutral
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Positive
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Negative
Questão 10
Questão
In a cathode ray tube, where does thermionic emission occur?
Responda
-
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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