Wien's law states that the peak wavelength is inversely proportional to the temperature. if star A is hotter (i. e. higher temperature) than star B, then star A will peak at a wavelength that is the peak wavelength of the spectrum of star B

If star A is hotter (i.e. higher temperature) than star B, then star A will peak at a wavelength that is SHORTER THAN the peak wavelength of the spectrum of star B

Explanation:

Wien's law states that the peak wavelength is inversely proportional to the temperature. That is, at increased temperature the wavelength of peak emission will be at a shorter wavelength. Frome the example of stars given, star A has a higher temperature than star B, therefore it's wavelength will peak at a wavelength that is shorter than the peak wavelength of the spectrum of star B.

car a and b are moving in opposite directions

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