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From Wien’s displacement law λₘ × T = constant, P = max. intensity is at violet.

1. λₘ is minimum → temp maximum
2. R = max. intensity is at green
3. λₘ is moderate → temp moderate
4. Q = max. intensity is at red → λₘ is maximum → temp minimum

Correct answer: λₘ is minimum → temp maximum

Solution

Wien's displacement law states that the wavelength of maximum intensity (λₘ) is inversely proportional to the temperature (T). Hence, when λₘ is minimum, the temperature is maximum.

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