DP Physics (last assessment 2024)

Question 21M.2.HL.TZ1.10b

Date	May 2021	Marks available	[Maximum mark: 2]	Reference code	21M.2.HL.TZ1.10b
Level	HL	Paper	2	Time zone	TZ1
Command term	Show that	Question number	b	Adapted from	N/A

[Maximum mark: 2]

21M.2.HL.TZ1.10b

In an electric circuit used to investigate the photoelectric effect, the voltage is varied until the reading in the ammeter is zero. The stopping voltage that produces this reading is 1.40 V.

(b)

Show that the maximum velocity of the photoelectrons is $700 {km s}^{- 1}$ .

[2]

Markscheme

« $e V = \frac{1}{2} m v^{2}$ » and manipulation to get $v$ ✓

$v = \sqrt{\frac{2 \times 1.6 \times 10^{- 19} \times 1.4}{9.1 \times 10^{- 31}}}$ OR $702 « {km s}^{- 1} »$ ✓

Must see either complete substitution or calculation to at least 3 s.f. for MP2

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Additional higher level (AHL)

Additional higher level (AHL) » Topic 12: Quantum and nuclear physics » 12.1 – The interaction of matter with radiation

Additional higher level (AHL) » Topic 12: Quantum and nuclear physics

Question 21M.2.HL.TZ1.10b

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