DP Physics (first assessment 2025)

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Question 21M.1A.HL.TZ1.38

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.1A.HL.TZ1.38
Level HL Paper 1A Time zone TZ1
Command term Question number 38 Adapted from N/A
38.
[Maximum mark: 1]
21M.1A.HL.TZ1.38

In a photoelectric effect experiment, a beam of light is incident on a metallic surface W in a vacuum.

The graph shows how the current I varies with the potential difference V when three different beams X, Y, and Z are incident on W at different times.

            I.   X and Y have the same frequency.
            II.  Y and Z have different intensity.
            III. Y and Z have the same frequency.

Which statements are correct?

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

[1]

Markscheme

C

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