Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET 2015
Exam
NEET
Year
2015
Subject
Physics
Chapter
Thermal Properties of Matter

NEET 2015 · Physics · Thermal Properties of Matter

On observing light from three different stars P , Q and R , it was...

On observing light from three different stars P\text{P} , Q\text{Q} and R\text{R} , it was found that intensity of violet colour is maximum in the spectrum of P\text{P} , the intensity of green colour is maximum in the spectrum of R\text{R} and the intensity of red colour is maximum in the spectrum of Q\text{Q} . If Tp,TQ{T}_{p}, {T}_{Q} and TR{T}_{R} are the respective absolute temperatures of P\text{P} , Q\text{Q} and R\text{R} , then it can be concluded from the above observations that :

Options

  1. ATP>TQ>TR{T}_{P} > {T}_{Q} > {T}_{R}
  2. BTP>TR>TQ{T}_{P} > {T}_{R} > {T}_{Q}
  3. CTP<TR<TQ{T}_{P} < {T}_{R} < {T}_{Q}
  4. DTP<TQ<TR{T}_{P} < {T}_{Q} < {T}_{R}

Correct answer

B. TP>TR>TQ{T}_{P} > {T}_{R} > {T}_{Q}

Step-by-step solution

From Wein's Displacement law,
>λmT=constant⇒λm∝1T{\lambda}_{m}T = constant ⇒ {\lambda}_{m} ∝ \dfrac{1}{T}
>From the light spectrum,
>(λm){\left({\lambda}_{m}\right)}_{P} < {\left({\lambda}_{m}\right)}_{R} < {\left({\lambda}_{m}\right)}_{Q} (as λRed>λGreen>λViolet{\lambda}_{\text{Red}} > {\lambda}_{\text{Green}} > {\lambda}_{\text{Violet}})
>Hence,
>TP>TR>TQ{T}_{P} > {T}_{R} > {T}_{Q}
Practice Thermal Properties of Matter on Quantrex Academy →

More from Thermal Properties of Matter

A cylindrical rod with one end in a steam chamber and the other end in ice results in… MHT CET Medical 2026A spherical blackbody of radius 10\ m is maintained at a temperature T , radiating power… MHT CET Medical 2026The rectangular surface area (12\ cm×6\ cm) of the black body, at a temperature 127^ ^ ∘… MHT CET Medical 2026A metal sphere cools at a rate of 2^ ^ ∘ C/min when the temperature is 80^ ^ ∘ C . If the… MHT CET Medical 2026A resistance thermometer has resistance 95\ Ω at the ice point and 140\ Ω at the steam… MHT CET Medical 2026A metal sphere cools from 80^ ^ ∘ C to 60^ ^ ∘ C in 10 minute. The time taken (in minute)… MHT CET Medical 2026If the temperature of 5 kg mass of a material of a specific heat capacity 200 J/kg ^ ^ ∘… MHT CET Medical 2026The initial temperature of a body is 80^ ^ ∘ C . If its temperature falls to 64^ ^ ∘ C in… MHT CET Medical 2026 Full Thermal Properties of Matter list All NEET PYQs