# LAST 13 YEAR NUMERICAL CHAPTER # 1 8

by • 28/05/2012 • 2nd Year PhysicsComments (1)1306

1995

Q) Find the wavelength of light which is capable of ionizing a hydrogen atom.

Given (Rh = 1.097x1O7)

(91.15×10-9m)

1997

Q) The energy of an electron in an excited hydrogen atom is -3.4ev. Calculate the angular momentum of the electron according to Bhars theory h = 6063×10-34.

(2.11 x 10 -34)

2000

Q) What is the wavelength of the radiation that is emitted when hydrogen atom undergoes a transition from n = 3 to n = 2.

(6.56 x 10-7)

2002 (PE)

Q) A photon of 12.1ev absorbed by a hydrogen atom originally in the ground state raises the atom to an excited state. What quantum number of this state?

(3)

2002 (PM)

Q) What is the largest wavelength of light capable of ionizing a hydrogen atom? What energy in electron volt is needed to ionize it?

(9.115 x 10 -8, 13.6ev)

2003 (PM)

Q) An electron in the hydrogen atom makes at transition from n =2 to n =1. Find wavelength in U.V region.

(1.21 x 10-7 m)

2004

Q) What minimum energy is required in an X-ray tube in order to produce X-ray with a wavelength of 0.1 x 10 -16 m?

(19.9 x 10 16 J)

Q) Compare the energy of a photon of wavelength 2 x 10 6 m with energy of X-ray photon of wavelength 2 x 10 -10 m.

(1 x 10 -4)

2005

Q) In hydrogen atom an electron experiences transaction from a state whose binding energy is 0.54ev to the state whose excitation energy is 10.2ev. Calculate:

1) The quantum number of two states

2) The wave length of photon emitted

(5, 2, 434 nm)

2007

Q) Calculate the binding energy of a hydrogen atom.

me = 9.11 x 10-31

e = 1.6 x 10 -19 C

Eo = 8.85 x 10 -12 C² /Nm²

h = 6.63 x 10 -34 J-sec

(-13.6)

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