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**Unformatted text preview: **r of the electronâ€™s orbit. (d) What do you think should be the relationship between r and Î» in the given state of the atom? Check if your values of r and Î» satisfy this relationship. 2. Calculate the frequency f of the photon emitted by a hydrogen atom making a transition from the state n = 4 to the state n = 3. Compare your result with the frequency of revolution f * of the electron in these two orbits. 3. Through what potential diï¬€erence would an electron have to be accelerated so that it has a de Broglie wavelength of: (i) 0.18 nm? (ii) 0.0018 nm? 4. Consider a photon and an electron that have a common wavelength Î» , while the energy E Î³ of the photon is one-half of the total energy E e of the electron. (a) What is the value of Î» in nm? (b) What are the values of E Î³ and E e in Mev? (c) What is the speed of the electron in m/s? 2...

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