Lesson 4.6.3.2

4.6.3.2 Perfect black bodies and radiation Quiz: AQA Physics, Unit 6

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.6.3.2, Perfect black bodies and radiation: 20 multiple choice questions for the AQA GCSE Physics (8463), Unit 6: Waves, written with Revision Ninja.

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The 20 questions

  1. At what temperature do bodies emit infrared radiation?

    • All temperatures
    • Above absolute zero only
    • Above room temperature only
    • Only when heated

  2. What factor determines the intensity and wavelength distribution of emitted radiation?

    • Temperature
    • Mass
    • Volume
    • Surface area

  3. How does the rate of absorption compare to emission for a body at constant temperature?

    • Zero absorption
    • Absorption faster
    • Equal rates
    • Emission faster

  4. When does the temperature of an object increase due to radiation?

    • Radiation stops
    • Absorption exceeds emission
    • Emission exceeds absorption
    • Rates are equal

  5. Name one major factor that determines the overall temperature of the Earth.

    • Atmospheric pressure
    • Ocean salinity
    • Radiation absorption rate
    • Earth magnetic field

  6. Give an everyday example of a body maintaining a constant temperature.

    • Melting ice cube
    • Boiling kettle
    • Steady room
    • Cooling tea

  7. What happens to Earth surface temperature if reflection of radiation into space increases?

    • Stays constant
    • Decreases
    • Doubles
    • Increases

  8. (Higher tier) Radiation emitted by a body exceeds the radiation it absorbs. What happens to its temperature over time?

    • It cools
    • It becomes transparent
    • It stays constant
    • It warms

  9. What factor reduces the radiation absorbed by the Earth's surface?

    • Reflection into space
    • Atmospheric pressure
    • Greater conduction
    • Increased emission

  10. What do diagram arrows represent when showing factors affecting Earth's temperature?

    • Convection currents
    • Magnetic fields
    • Gravitational pull
    • Radiation transfer

  11. Which two properties of emitted radiation depend directly on the temperature of a body?

    • Charge and voltage
    • Intensity and wavelength
    • Mass and volume
    • Density and pressure

  12. Which body emits radiation with a shorter typical peak wavelength?

    • The hotter body
    • The larger body
    • The cooler body
    • The heavier body

  13. What condition defines thermal equilibrium for a body at constant temperature?

    • Maximum reflection
    • Zero emission
    • Balanced rates
    • Zero absorption

  14. Of two identical bodies at different temperatures, which radiates more infrared each second?

    • The cooler body
    • The hotter body
    • Both radiate equally
    • Neither radiates

  15. (Higher tier) A body absorbs radiation much faster than it emits. What happens to its temperature?

    • It falls
    • It stays constant
    • It rises
    • It becomes zero

  16. An object at constant temperature emits infrared. What must be true of its absorption?

    • Equal absorption rate
    • Lower absorption rate
    • Zero absorption
    • Higher absorption rate

  17. What balance primarily determines the steady temperature of the Earth?

    • Absorbed and emitted
    • Magnetic and electric
    • Refracted and reflected
    • Conducted and convection

  18. The temperature of any body depends on the balance between radiation emitted and what else?

    • Internal pressure
    • Radiation absorbed
    • Radiation reflected
    • Thermal conduction

  19. What happens to the temperature of a surface that absorbs more radiation than it emits?

    • It falls
    • It rises
    • It stays constant
    • It drops to zero

  20. Which property causes a hot body to emit more infrared than a cool body?

    • Higher temperature
    • Greater mass
    • Larger volume
    • Higher density

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