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GCSE Combined Science · key term
An object or device that emits waves, transferring energy away from it.
Used by OCR
Specification B2.2g, P4.2b · Biology Paper 1, Physics Paper 2
A part of a plant that supplies sugars to the phloem, such as a photosynthesising leaf.
Revise: Transpiration and TranslocationTransport is from a source, which supplies sugars, to a sink, which removes them for use or storage. A photosynthesising leaf is a source. Growing root tips, developing fruits and storage organs can be sinks.
For translocation, name the transported substances, phloem, and a source and sink. Do not say it only happens downwards.
For an energy-transfer example, identify the source, the type of electromagnetic wave and the absorber, then describe the effect on the absorber.
In an energy-transfer explanation, identify the source, the radiation and the absorber.
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Physics, Combined Science
An object or device that emits radiation.
Revise: Electromagnetic Spectrum Properties and Radio WavesThis energy comparison concerns the radiation's frequency. It does not mean that every gamma-ray source transfers more energy overall than every radio transmitter: the amount of radiation emitted also matters.
