alex.examtime9373
Quiz by , created more than 1 year ago

This quiz covers topics learnt in the mind map on the electron, and the corresponding notes on subatomic particles, energy, thermionic emission, x-rays and the photoelectric effect.

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alex.examtime9373
Created by alex.examtime9373 almost 11 years ago
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The Electron: Quiz

Question 1 of 10

1

What is the mass of an electron?

Select one of the following:

  • I u

  • - 1 u

  • 1/1840 u

  • 1/1840 g

Explanation

Question 2 of 10

1

What unit is used to measure the energy of an electron?

Select one of the following:

  • Joules

  • Watts

  • Electronvolts

Explanation

Question 3 of 10

1

Thermionic emission is the emission of electrons from the surface of a hot metal.

Select one of the following:

  • True
  • False

Explanation

Question 4 of 10

1

What is the work function of a metal?

Select one of the following:

  • 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

Explanation

Question 5 of 10

1

What phenomenon is the cathode ray tube based on?

Select one of the following:

  • Photoelectric effect

  • Thermionic emission

  • X-rays

Explanation

Question 6 of 10

1

X-rays are electromagnetic radiation of extremely long wavelength.

Select one of the following:

  • True
  • False

Explanation

Question 7 of 10

1

Which of the following is not a component of an X-ray tube?

Select one of the following:

  • Cathode & anode

  • Filament

  • Tungsten target

  • Fluorescent screen

  • Vacuum

Explanation

Question 8 of 10

1

Calculate the energy of a photon of light of frequency 8 x 10^14

Planck's constant = 6.6 x 10^-34 J s

Select one of the following:

  • 5.28 × 10^-19

  • 1.21 x 10^48

  • 5.28 × 10^19

Explanation

Question 9 of 10

1

What is the charge of a proton?

Select one of the following:

  • Neutral

  • Positive

  • Negative

Explanation

Question 10 of 10

1

In a cathode ray tube, where does thermionic emission occur?

Select one of the following:

  • At the cathode

  • At the anode

  • Along the filament

  • Across the fluorescent screen

Explanation

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