All bodies emit electromagnetic radiation - OCR Gateway - GCSE Physics - Question 10 - 2019 - Paper 1
Question 10
All bodies emit electromagnetic radiation.
Body R is at a higher temperature than body S.
Which statement is correct?
A R emits radiation with a mean higher frequ... show full transcript
Worked Solution & Example Answer:All bodies emit electromagnetic radiation - OCR Gateway - GCSE Physics - Question 10 - 2019 - Paper 1
Step 1
A R emits radiation with a mean higher frequency.
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Answer
This statement is correct. According to Wien's Displacement Law, as the temperature of a body increases, the peak frequency of the emitted radiation also increases. Therefore, body R, being at a higher temperature than body S, emits radiation with a higher mean frequency.
Step 2
B R emits radiation with a mean longer wavelength.
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Answer
This statement is incorrect. A higher temperature means a higher frequency and, consequently, a shorter wavelength. Thus, body R does not emit radiation with a longer wavelength.
Step 3
C S emits radiation with a higher intensity.
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Answer
This statement cannot be determined without more information. Intensity depends on both the temperature and surface area of the bodies. However, since R is at a higher temperature, it likely emits radiation with higher intensity compared to S.
Step 4
D S emits radiation with a mean shorter wavelength.
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Answer
This statement is incorrect. As explained earlier, body R at a higher temperature emits radiation with a mean shorter wavelength, not body S.
