DP Physics (first assessment 2025)

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Question 22N.1A.SL.TZ0.29

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Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.1A.SL.TZ0.29
Level SL Paper 1A Time zone TZ0
Command term Question number 29 Adapted from N/A
29.
[Maximum mark: 1]
22N.1A.SL.TZ0.29

When heating a metal rod at one end, thermal energy is transferred along the rod.

Which statement explains this transfer?


A.  Free electrons transfer kinetic energy to the ions in the metal

B.  Intermolecular potential energy increases throughout the metal

C.  Intermolecular potential energy is transferred to kinetic energy

D.  Ions in the metal radiate energy in all directions

[1]

Markscheme

A

Examiners report

Alternative A is not necessarily the only possible explanation of the energy transfer, but it is certainly the best one of the four. Metals are usually good thermal conductors for the same reason that they are excellent electrical conductors - thanks to the presence of free electrons.

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