DP Physics (first assessment 2025)

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Question 21M.1A.SL.TZ1.14

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Date May 2021 Marks available [Maximum mark: 1] Reference code 21M.1A.SL.TZ1.14
Level SL Paper 1A Time zone TZ1
Command term Question number 14 Adapted from N/A
14.
[Maximum mark: 1]
21M.1A.SL.TZ1.14

A metal rod of length 45 cm is clamped at its mid point. The speed of sound in the metal rod is 1500 m s−1 and the speed of sound in air is 300 m s−1. The metal rod vibrates at its first harmonic. What is the wavelength in air of the sound wave produced by the metal rod?

A. 4.5 cm

B. 9.0 cm

C. 18 cm

D. 90 cm

[1]

Markscheme

C

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