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Question 18M.2.HL.TZ1.b.iii

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.2.HL.TZ1.b.iii
Level HL Paper 2 Time zone TZ1
Command term Write down Question number b.iii Adapted from N/A
b.iii.
[Maximum mark: 1]
18M.2.HL.TZ1.b.iii

Hydrogen atoms in an ultraviolet (UV) lamp make transitions from the first excited state to the ground state. Photons are emitted and are incident on a photoelectric surface as shown.

M18/4/PHYSI/HP2/ENG/TZ1/08

The photons cause the emission of electrons from the photoelectric surface. The work function of the photoelectric surface is 5.1 eV.

The variable voltage can be adjusted so that no electrons reach the collecting plate. Write down the minimum value of the voltage for which no electrons reach the collecting plate.

[1]

Markscheme

4.9 «V»

 

Allow 5.1 if 10.2 is used in (b)(i).

Ignore sign on answer.

[1 mark]

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