Infrared
3 marks · EasyA loaf of bread is placed under a toaster grill. The grill heats up and glows red.
Identify the type of electromagnetic radiation emitted by the hot grill.
Explain how this radiation cooks the bread.
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Show answer
(a) Infrared radiation
(b) The bread absorbs the infrared radiation, which increases its temperature and cooks it.
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Correctly identifies infrared radiation.
B2 (b) · 1 mark · States bread absorbs infrared radiation.
B3 (b) · 1 mark · States this causes heating/cooking of bread.
Worked solution
a) The grill emits infrared radiation. b) The bread absorbs this infrared, so its temperature increases and it cooks.