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Byju's Answer

Standard XII

Physics

Wien's Displacement Law

On observing ...

Question

On observing light from three different stars P, Q and R, it was found that intensity of violet colour is maximum in the spectrum of P, the intensity of green colour is maximumin the spectrum of R and the intensity of red colour is maximum in the spectrum of Q. If $T_{P}, T_{Q} a n d T_{R}$ are the respective absolute temperatures of P, Q and R, then it can be concluded from the above observations that :

T_P< T_Q< T_R

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T_P> T_Q> T_R

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T_P> T_R> T_Q

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T_P< T_R< T_Q

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Solution

The correct option is B
T_P> T_Q> T_R

Accordingly to Wien‘s law

$λ α \frac{1}{T} a n d λ_{V} < λ_{G} λ_{R}$
$∴ T_{P} > T_{Q} > T_{R}$

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Similar questions

Q. On observing light from three different stars P, Q and R, it was found that intensity of violet colour is maximum in the spectrum of P, the intensity of green colour is maximum in the spectrum of R and the intensity of red colour is maximum in the spectrum of Q. If

T_{P}, T_{Q}

and

T_{R}

are the respective absolute temperature of P, Q and R, then it can be concluded from the above observations that

Q. TP and TQ are any two tangents to a parabola and the tangent at a third point R cuts them in P' and Q'; prove that :

\frac{T P^{'}}{T P} + \frac{T Q^{'}}{T Q} = 1

Q. Assertion :There exists no A.P. whose three terms are

\sqrt{3}, \sqrt{5}

and

\sqrt{7}

. Reason: If

t_{p}, t_{q}

and

t_{r}

are three distinct terms of an A.P., then

\frac{t_{r} - t_{p}}{t_{q} - t_{p}}

is a rational number.

On investigation of light from three different stars A, B and C, it was found that in the spectrum of A the intensity of red colour is maximum, in B the intensity of blue colour is maximum and in C the intensity of yellow colour is maximum. From these observations it can be concluded that

Q. For an A.P.,

T_{p} = q

and

T_{q} = p

, then

T_{p + q} =

..........

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The correct option is B TP > TQ> TR Accordingly to Wien‘s law λα1T and λV<λGλR ∴ TP>TQ>TR

The correct option is B
T_P> T_Q> T_R

Accordingly to Wien‘s law

$λ α \frac{1}{T} a n d λ_{V} < λ_{G} λ_{R}$
$∴ T_{P} > T_{Q} > T_{R}$