Black-body radiationEdexcel A-Level Physics: Mind map

Exam questions on Black-body radiation

1. The interior of a furnace is held at a constant temperature of 1500 K. Engineers model the furnace interior as a black-body radiator.
   The temperature of the furnace interior is raised to 1800 K. State and explain two ways in which the radiation curve of the furnace changes.2 marks
2. A star has a constant radius while its surface temperature rises from 5000 K to 10 000 K. Treat the star as a black body.
   Explain why the star appears bluer when its surface temperature is 10 000 K than when it is 5000 K.2 marks
3. The Sun radiates approximately as a black body. The wavelength at which it emits radiation most intensely is 5.0 × 10⁻⁷ m, and its radius is 7.0 × 10⁸ m.
   Calculate the surface temperature of the Sun.3 marks