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Question 19N.2.HL.TZ0.a(ii)

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.2.HL.TZ0.a(ii)
Level HL Paper 2 Time zone TZ0
Command term Explain Question number a(ii) Adapted from N/A
a(ii).
[Maximum mark: 2]
19N.2.HL.TZ0.a(ii)

Monochromatic light of very low intensity is incident on a metal surface. The light causes the emission of electrons almost instantaneously. Explain how this observation

does support the photon nature of light.

[2]

Markscheme

«in the photon theory of light» the electron interacts with a single photon ✔
and absorbs all the energy OR and can leave the metal immediately ✔

NOTE: Reference to photon-electron collision scores MP1

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