DP Physics (first assessment 2025)

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Question 19M.1A.SL.TZ1.18

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.1A.SL.TZ1.18
Level SL Paper 1A Time zone TZ1
Command term Question number 18 Adapted from N/A
18.
[Maximum mark: 1]
19M.1A.SL.TZ1.18

A string fixed at both ends vibrates in the first harmonic with frequency 400 Hz. The speed of sound in the string is 480 m s–1. What is the length of the string?

A. 0.42 m

B. 0.60 m

C. 0.84 m

D. 1.2 m

[1]

Markscheme

B

Examiners report

Response D was the most common option selected, perhaps by students equating the wavelength of the sound with the length of the string, or incorrectly taking the first harmonic to be the fundamental frequency.

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