Physics Test 10

Result

Physics Test 10

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Weekly Quiz Competition

Question 1
4 / -1

Two stars P and Q have slightly different surface temperatures T_P and T_Qrespectively with T_p > T_Q Both stars are receding from the earth with speed v_P and v_Q relative to the earth. The wavelength of light at which they radiate the maximum energy is found to be the same for both–

A
v_P > v_Q

B
v_P < v_Q

C
v_P = v_Q, and the size of Q > the size of P

D
Nothing can be said regarding v_P and v_Q from the given data

Solution

Let λ_P and λ_Q be the actual wavelengths the at which P and Q radiate maximum energy. By wein's law, λ_PT_P = λ_QT_Q

As T_P > T_Q⇒ λ_P < λ_Q. As wavelengths apear equal on reaching the earth λ_P has increased more than λ_Q⇒ v_P > v_Q