DP Physics (last assessment 2024)

Question 20N.3.HL.TZ0.6

Date	November 2020	Marks available	[Maximum mark: 5]	Reference code	20N.3.HL.TZ0.6
Level	HL	Paper	3	Time zone	TZ0
Command term	Calculate, Define, Suggest	Question number	6	Adapted from	N/A

[Maximum mark: 5]

20N.3.HL.TZ0.6

A deuterium $({}_{1}^{2}H)$ nucleus (rest mass $2.014 u$ ) is accelerated by a potential difference of $2.700 \times 10^{2} MV$ .

(a)

Define rest mass.

[1]

Markscheme

invariant mass
OR
mass of object when not in motion/in object’s rest frame ✓

Examiners report

The definition of rest mass proved to be known by most candidates.

(b)

Calculate the total energy of the deuterium particle in $MeV$ .

[2]

Markscheme

«rest energy =» $(2.014 \times 931.5) « MeV »$ ✓

$« E_{T} = KE + rest energy = 270.0 + (2.014 \times 931.5) = » 2146 « MeV »$ ✓

Final answer accept $3.443 \times 10^{- 10} J$ if unit given

Award [2] marks for a bald correct answer.

Examiners report

Most were able to score full marks. A few candidates messed up by trying to convert to J, although some were successful with this additional difficulty.

(c)

In relativistic reactions the mass of the products may be less than the mass of the reactants. Suggest what happens to the missing mass.

[2]

Markscheme

is converted to energy ✓

as kinetic energy of the products ✓

Examiners report

Answers scored at least one or usually both marks.

Syllabus sections

Option A: Relativity

Option A: Relativity » Option A: Relativity (Additional higher level option topics) » A.4 – Relativistic mechanics (HL only)

Option A: Relativity » Option A: Relativity (Additional higher level option topics)

Question 20N.3.HL.TZ0.6

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