DP Physics (first assessment 2025)

Question EXE.1A.HL.TZ0.29

Date	Example questions Example questions	Marks available	[Maximum mark: 1]	Reference code	EXE.1A.HL.TZ0.29
Level	HL	Paper	1A	Time zone	TZ0
Command term		Question number	29	Adapted from	N/A

29.

[Maximum mark: 1]

EXE.1A.HL.TZ0.29

An atom of hydrogen ( ${}_{1}^{1}H$ ) and an atom of helium ( ${}_{2}^{4}{He}$ ) are moving with the same kinetic energy.

The de Broglie wavelength of the hydrogen atom is $λ_{H}$ and the de Broglie wavelength of the helium atom is $λ_{He}$ .

What is $\frac{λ_{H}}{λ_{He}}$ ?

A. $\frac{1}{2}$

B. $1$

C. $2$

D. $4$

[1]

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