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Two stars, P and Q, are observed from Earth - Edexcel - A-Level Physics - Question 3 - 2023 - Paper 2
Question 3
Two stars, P and Q, are observed from Earth. The intensity of radiation from P is less than that from Q. The parallax angle for P is greater than that for Q. Which ... show full transcript
Worked Solution & Example Answer:Two stars, P and Q, are observed from Earth - Edexcel - A-Level Physics - Question 3 - 2023 - Paper 2
Step 1
P is closer than Q
Answer
Given that the intensity of radiation from P is less than that from Q while the parallax angle for P is greater, we can infer that P is indeed closer than Q. The relationship between intensity (brightness) and distance suggests that if the intensity is lower for a closer star, it must be less luminous. Therefore, the luminosity of P must be less than that of Q.