An astronomer measures the total intensity of the radiation emitted from each square metre of the surfaces of two stars, X and Y.
| Star | Total intensity emitted from the surface in MW/m2\mathrm{MW/m^2}MW/m2 |
|---|---|
| X | 15 |
| Y | 60 |
Which statement about the two stars is correct?
Star X has the hotter surface, and its emission peaks at a shorter wavelength than that of star Y.
Star Y has the hotter surface, and its emission peaks at a longer wavelength than that of star X.
Star Y has the hotter surface, and its emission peaks at a shorter wavelength than that of star X.
Star X has the hotter surface, and its emission peaks at a longer wavelength than that of star Y.
96 exam-style questions on Edexcel GCSE Physics 5.3 Black body radiation, covering 5.3.1 Emission of radiation and temperature, 5.3.2 Radiation balance and constant temperature, and 5.3.3 The temperature of the Earth. Each one has a worked solution and a mark scheme showing where the marks go.