AQA · Physics · 8463
GCSE Physics: Perfect black bodies and radiation
Waves · AQA GCSE Physics (8463), specification point 4.6.3.2. Cards are generated from the exam board's own specification for "Perfect black bodies and radiation", and every card links back to the page it came from. Separate science only. Specification © AQA — used with attribution.
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Which bodies (objects) emit radiation?
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All bodies emit radiation, whatever their temperature.
What property of a body determines the intensity of the radiation it emits?
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Its temperature.
The wavelength distribution of a body's emitted radiation depends on its ?.
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temperature
How do the rates of absorption and emission of radiation compare for a body at constant temperature?
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They are equal — the body absorbs radiation at the same rate as it emits it.
Under what condition does the temperature of a body increase?
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When it absorbs radiation faster than it emits radiation.
What happens to a body's temperature if it emits radiation faster than it absorbs it?
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Its temperature decreases (it cools down).
Name one factor that determines the temperature of the Earth.
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The rate of absorption of radiation, the rate of emission of radiation, or the reflection of radiation back into space (any one).
Radiation that is ? back into space does not warm the Earth's surface.
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reflected
Why does the Earth's average temperature stay roughly constant over time?
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Because the rate at which it absorbs incoming radiation is balanced by the rate at which it emits radiation back into space.
Why can a moving magnet in a coil be useful to engineers?
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A magnet moving in a coil produces an electric current (electromagnetic induction).
What effect can a current flowing near a magnet produce?
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Movement (a force on the current-carrying conductor) — the basis of the motor effect.
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