How many revolutions does the electron in the hydrogen atom in the ground state make per second? (h = 6.63x10 Js, mass of clectron = 9.11x101 kg, Bohr radius = 0.053 nm.) A- 6.55x1015 B- 3.28x1015 C- 3.28x10 D- 1.64x105 E- 9.11x105 The ionisation energy of the hydrogen atom is 13.6 eV. If hydrogen atoms in the ground state absorb quanta of encrgy 12.75 eV, how many discrete spectral lines will be emitted as per Bohr's theory? A- 1 В-2 С-4 D- 6 E- zero The electron in a hydrogen atom makes a transition from an excited state to the ground state. Which of the following statements is true? A- Its kinetic energy increases and its potential and total energies decrease. B- Its kinetic energy decreases, potential energy increases and its total energy remains the same. C- ts kinetic and total energies decrease and its potential energy increases. D- Its kinetic, potential and total energies decrease. An electron in a Haydrogen atom undergoes a transition from the state n = 4 to n = 2. The energy of the photon emitted in this process is A- 1.275 ev B- 2.55 eV C- 3.4 eV D- 5.1 eV E- 13.6 eV • If 13.6 cV energy is required to ionize the hydrogen atom, then energy required to remove an electron from n=2 is A- 10.2 ev B- OeV C- 3.4 eV D- 6.8 eV. In Bohr's model of an atom which of the following is an integral multiple of h2n? A- Kinetic energy B- Radius of an atom C- Potential energy D- Angular momentum

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