The top surface of the passenger car of a train moving at a velocity of 70 km/h is 2.8 m wide and 8 m long. the top surface is absorbing solar radiation at a rate of 200 w/m2,and the temperature of the ambient air is 30°c. assuming theroof of the car to be perfectly insulated and the radiation heatexchange with the surroundings to be small relative to convection, determine the equilibrium temperature of the top surface of the car.

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you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m