Specific charge of the electron (AQA A-Level Physics): Quizzes

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Specific charge of the electron
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What does the symbol em\frac{e}{m} represent for an electron?

Charge-to-mass ratio

In the Fine Beam Tube method, what role does the magnetic force play?

Acts as centripetal force

How does the electron path become visible in the Fine Beam Tube?

Gas atoms emit photons when de-exciting

Which formula is used in the Fine Beam Tube method?

em=2VB2r2\frac{e}{m} = \frac{2V}{B^2 r^2}

What is the key feature of Thomson's Crossed Fields method?

Perpendicular electric & magnetic fields

In Thomson's method, when is the electron beam undeflected?

When forces are equal and opposite

What did Thomson's constant specific charge result confirm?

All atoms contain electrons

What is the specific charge of an electron?

1.76×10111.76 \times 10^{11} Ckg⁻¹

How does electron specific charge compare to proton specific charge?

About 1800 times larger

Which model did Thomson propose from his specific charge measurements?

Plum pudding model

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