ibo.org
Updates to Questionbank

User interface language: English | Español

« Back to questions in DP Physics

Date November 2012 Marks available 1 Reference code 12N.1.HL.TZ0.34
Level Higher level Paper Paper 1 Time zone Time zone 0
Command term Question number 34 Adapted from N/A

Question

Photons are incident on a metal surface. Electrons are emitted from the surface. What single change may result in no electrons being emitted from the surface?

A. Doubling the wavelength of the photons
B. Halving the wavelength of the photons
C. Doubling the number of photons incident on the surface per second
D. Halving the number of photons incident on the surface per second

Markscheme

A

Examiners report

Photons are emitted so the wavelength of the light is shorter than the threshold wavelength. Doubling the wavelength might make it greater than the threshold and so this is the only option which may result in no electrons being emitted – the intensity of light (that is, the number of photons per second) has no influence on this.

Syllabus sections

Additional higher level (AHL) » Topic 12: Quantum and nuclear physics » 12.1 – The interaction of matter with radiation
Show 140 related questions
Hide related questions

View options

Ib logo tri med

© International Baccalaureate Organization 2018
International Baccalaureate® - Baccalauréat International® - Bachillerato Internacional®

Printed for IB Documents Team