Perfect Black Bodies And Radiation (physics Only) (GCSE Physics)

A black body in a furnace at uniform temperature emits radiation. Which is true about directionality of emission?

Which device gives the closest laboratory approximation to a perfect black body for emission and absorption tests?

The sun’s surface (~5800 K) peaks in visible light and a cooler object (~300 K) peaks in infrared. This difference is explained by

Which of these best describes Kirchhoff’s law in words?

A perfect black body at temperature T has a continuous emission spectrum. Which statement is true?

A material’s emissivity determines how well it radiates energy. If emissivity is 0.6, then at a given temperature the emitted power per unit area is

Which statement about emission and absorption for a perfect black body is correct?

If a body has emissivity e and temperature T, the total emitted power per unit area = esT4. If T doubles and e stays same, emitted power changes by factor

Which statement about selective emitters is correct?

A perfect black body has emissivity equal to

Wien’s displacement idea (qualitative) says the peak wavelength of black-body radiation is inversely proportional to temperature. Which sentence matches that law?