JUN25 74083 BA01 - For Examiner’s Use Question Mark TOTAL Tuesda...

*JUN25 74083 BA01*

IB/M/Jun25/G4006/E7 7408/3BA

For Examiner’s Use Question Mark 1 2 3 4 5 TOTAL

Tuesday 17 June 2025 Morning

Materials

For this paper you must have:

• a pencil and a ruler • a scientific calculator • a Data and Formulae Booklet • a protractor.

Instructions • Use black ink or black ball-point pen.• Fill in the boxes at the top of this page.• Answer all questions.• You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages.• If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s).• Do all rough work in this book. Cross through any work you do not want to be marked.• Show all your working.

Information • The marks for questions are shown in brackets.• The maximum mark for this paper is 35.• You are expected to use a scientific calculator where appropriate.• A Data and Formulae Booklet is provided as a loose insert.Please write clearly in block capitals.Centre number

Candidate number

Surname

Forename(s)

Candidate signature

I declare this is my own work.A-level

PHYSICS

Paper 3 Section B Astrophysics

Time allowed: The total time for

both sections of this paper is

• hours. You are advised to

spend approximately 50 minutes on this section. 1 / 3

2

*02* IB/M/Jun25/7408/3BA

Do not write outside the box Section B

Answer all questions in this section.

• 1

HIP 56948 is a star with a black-body temperature of 5800 K. The star is at a distance of 210 ly from the Sun.

• 1

. 1 Sketch, on Figure 1, the black-body curve for HIP 56948.Label the wavelength axis with a suitable scale and unit.[3 marks]

Figure 1

• 1

. 2

The diameter of HIP 56948 is the same as the diameter of the Sun.

Suggest a value for the absolute magnitude of HIP 56948.[1 mark]

absolute magnitude =

• 1

. 3 Astronomers study HIP 56948 in their search for Earth-like exoplanets because HIP 56948 is similar to the Sun.

Suggest one difficulty in detecting an Earth-like planet around HIP 56948.[1 mark]

5

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3

*03* Turn over ►

IB/M/Jun25/7408/3BA

Do not write outside the box

• 2

. 1

Draw a ray diagram for an astronomical telescope in normal adjustment.

Include in your diagram:

• three non- axial rays • labelled principal foci for the lenses.[2 marks]

Question 2 continues on the next page

• / 3