International A Level (IAL)PhysicsEdexcelExam Questions5. Thermodynamics, Radiation, Oscillations & CosmologyBlack Body Radiation

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

Exam code: YPH11

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

Two stars, X and Y, behave as black body radiators. The graphs show how the intensity I of radiation emitted varies with wavelength λ for the two stars.

q10-wph15-05-june-2021-edexcel-int-as-and-a-level-phy

The stars are both viewed from the same distance.

Which of the following statements can be deduced from the two graphs?

  • Star X is brighter and has a higher surface temperature than star Y.

  • Star X is brighter and has a lower surface temperature than star Y.

  • Star X is dimmer and has a higher surface temperature than star Y.

  • Star X is dimmer and has a lower surface temperature than star Y.

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