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Validating the Bohr's Model

When an elect...

Question

When an electron falls from a higher energy a lower energy level, the difference in the energies appears in the from of electromagnetic radiation. Why cannot it be emitted as other forms of energy?

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Solution

The electrons are charged particles. When an electron falls from a higher energy to a lower energy level, it accelerates. We know accelerating charged particle radiates energy in the form of electromagnetic radiation.

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Q. (a) As long as an electron revolves in a particular orbit, the electron does not lose its energy. Therefore, these orbits are called stationary orbits and the electrons are said to be in stationary energy states.
(b) Each orbit or shell is associated with a definite amount of energy. Hence these are also called energy levels.
(c) An electron jumps from a lower energy level to a higher energy level, by absorbing energy. It jumps from a higher energy level to a lower energy level, by emitting energy in the form of electromagnetic radiation.
(d) Electrons move around the nucleus in specified circular paths called orbits or shells or energy levels and are designated as K, L, M, N shells respectively.

Arrange the above postulates of Bohr's theory in a correct sequence:

Q. When electromagnetic radiation at wavelength 300nm falls on the surface of sodium, electrons are emitted with a kinetic energy of

1.68 \times 10^{5} J {m o l}^{- 1}

. What Is the minimum energy needed to remove an electron from sodium?

Q. When electromagnetic radiation of wavelength 300 nm falls on the surface of sodium, electrons are emitted with a kinetic energy of

1.68 \times 10^{5} J m o l^{- 1}

. What is the minimum energy needed to remove an electron from sodium?

Q. Calculate the wavelength of the radiations emitted when an electron in a hydrogen atom undergoes a transition from

4^{t h}

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2^{n d}

energy level. In which part of the electromagnetic spectrum does this line lie?

Q. An electron present in an atom can move from a lower energy level to a level of higher energy by absorbing the appropriate energy.

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