Two identical gas particles (same mass) have different de Broglie wavelengths, gas particle A has a larger (longer) wavelength than gas particle B. Which one is travelling at a higher velocity? Briefly explain why for each one. (One sentence or one equation)

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Q: According to the simple de Broglie model, how many wavelengths are there in an electron wave in the…

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Wien's displacement law

Students often get confused between Wien's displacement law and Planck's radiation law. Although both are historically related, yet they are conceptually different. Planck's law helps determine the spectrum of a blackbody, while Wien's law determines the relationship between peak wavelength and temperature.