Old is Gold-Quantization of energy solved Numericals

79.
The first member of Balmer series of hydrogen atom has an wavelength of 6563 Angstrom calculate the wavelength of it's second member.
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80.Calculate the de broglie wavelength of electron having kinetic energy 400 ev.
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81.Calculate the wavelength of electromagnetic radiation emitted by a hydrogen atom which undergoes a transition between energy levels of -1.36*10^-19J and -5.45*10^-19J.
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86.Determine  the energy that must be given to the hydrogen atom so that it can emit second line of Balmer series. (Rydberg's Constant R=1.097*10^7/m)
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87.Find the wavelength of the radiation emitted from a hydrogen atom when an electron jumps from fourth to the second orbit.

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88.A cricket ball is moving with a spped of 120km/hr. What would be it's de-Broglie wavelength if it's mass is 400gms.

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90Find the wavelength of radiation emitted from hydrogen atom when an electron jumps from third orbit to second orbit.

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95.Find the wavelength of radiation emitted from hydrogen atom when an electron jumps from third orbit to second orbit.

ans:

Same as 90.

96.Obtain the de Broglie wavelength of a neutron of Kinetic energy 150ev.

(mass of neutron=1.675*10^-27Kg)

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98.If an  electron position can be measured to an accuracy of 10^-9 m.  How accuracy can it's velocity be measured?

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99.Obtain the de Broglie wavelength of a electron of Kinetic energy 3600eV.

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101.Obtain the de Broglie wavelength of a neutron of Kinetic energy 150ev.

ans:

Same as 96

102.An electron of energy 20 easy comes into collision with a hydrogen atom in its ground state. The atom is excited into a higher state and electron is scattered with a reduced velocity. The atom subsequently returns to it's ground state with the emission of photon of wavelength 1.216*10^-7m. Determine the velocity of the scattered electron. 

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103.Calculate the wavelength of the first line of Balmer series, if the wavelength of the second line of this series is 4.86*10^-7m.

ans:

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