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Hertz's Observations

59. What cons...

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59. What considration led de broglie to suggedt that material partical can also show wave property??

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Q. Show that Bohr's second postulate can be explained on the basis of de Broglie hypothesis of wave nature of electrons.

Q. The ratio of the de-Broglie wavelength of a deuterium atom to that of

α - p a r t i c a l

when then the velocity of former is five times greater than that of later is:

Q. De Broglie proposed the wave nature of electrons suggesting matter waves.
Find the momentum, speed and De-Broglie wavelength of an electron with Kinetic energy of

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Q. What are de-Broglie waves? Establish the de-Broglie wavelength equation.

Q. The French physicist Louis de Broglie in 1924 postulated that matter, like radiation, should exhibit a dual behaviour. He proposed the following relationship between the wavelength lambda of a material particle, its linear momentum p and planck constant h.

λ = \frac{h}{p} = \frac{h}{m v}

The de Broglie relation implies that the wavelength of a particle should decrease as its velocity increases. It also implies that for a given velocity heavier particles should have shorter wavelength than lighter particles. The waves associated with particles in motion are called matter waves or de Broglie waves. These waves differ from the electromagnetic waves as they

(i)

have lower velocities

(i i)

have no electrical and magnetic fields and

(i i i)

are not emitted by the particle under consideration.
The experimental confirmation of the de Broglie’s relation was obtained when Davisson and Germer, in 1927, observed that a beam of electrons is diffracted by a nickel crystal. As diffraction is a characteristic property of waves, hence the beam of electron behaves as a wave, as proposed by de Broglie.

Using Bohr’s theory, the transition, so that the electron's de-Broglie wavelength becomes 3 times of its original value in

H e^{+}

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