A LevelPhysicsEdexcelExam Questions9. ThermodynamicsBlack Body Radiation

Black Body Radiation (Edexcel A Level Physics): Exam Questions

Exam code: 9PH0

40 mins7 questions

Select a download format for Black Body Radiation

Scroll for more

Select an answer set to view for
Black Body Radiation

1
1 mark

A star of diameter D and surface temperature T has luminosity L.

What is the luminosity of a star of diameter D2 and surface temperature 2T ? 

  • L4

  • L

  • 4L

  • 16L

Choose your answer

2
1 mark

Two stars, P and Q, have the same radius.

The graph shows how the intensity I of radiation received at Earth from star P and star Q varies with wavelength λ.

A graph of intensity against wavelength showing two black-body radiation curves. Both curves rise steeply from short wavelengths and decay gradually towards long wavelengths. Curve P peaks at a higher maximum intensity and a shorter wavelength than Q. Curve Q peaks at a lower maximum intensity and a longer wavelength than P.

Which statement about the two stars is correct?

  • Star Q has a higher surface temperature than star P

  • Star P has a higher surface temperature than star Q, but a lower luminosity

  • The two stars have the same surface temperature, but star P has a greater luminosity

  • Star P has a higher surface temperature than star Q, and a greater luminosity

Choose your answer