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A) A dark-adapted human eye at the peak of its sensitivity (510 nm) can perceive a...

A) A dark-adapted human eye at the peak of its sensitivity (510 nm) can perceive a flash when 3.5 x 10-15 J of energy enter the iris. How many photons is this? (In fact only 10% of these are absorbed by the retina.)


B) Use conservation of energy to calculate the speed of the electron when it is in the ground state of a hydrogen atom (ionization energy 13.6 eV). What is the de Broglie wavelength of this electron? Does the value make sense?

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