CBSE Guess > Papers > Important Questions > Class XII > 2007 > Chemistry > Atomic Structure
Atomic Structure
Q. 1. Kinetic energy of a moving electron is 4.55×10-25J.Determine the wavelength of the electron.[mass of electron is 9.1×10-31 Kg, h is 6.63×10-34 Jsec]
Q. 2. Kinetic energy of a particle is 6.63 × 10-25 J. Determine its frequency .
Q. 3. Calculate the wavelength of α particle moving with a velocity of 3×103 m/sec.
Q. 4. Calculate the momentum of an electron moving with a wavelength of 7.5 × 10-6 m.
Q. 5. Calculate the product of uncertainty in velocity and uncertainty in position of moving electron.
Q. 6. The uncertainty in the position of a moving bullet of mass 10g is 10-5m. Calculate uncertainty in its velocity.
Q. 7. On the basis of uncertainty principle, show that electron cannot exist with in the atomic nucleus (radius = 10-15m)
Q. 8. Two particles A and B are in motion. If the wavelength of A is 5 x 10-8m. Find wavelength of B if the Momentum of B is half the momentum of A.
Q. 9. The Sodium flame has λ = 589nm.What is the mass equivalence of one photon of this wavelength.
Q. 10. Calculate the uncertainty in velocity of wagon of mass 2000kg whose position is known to an Accuracy of ± 10m.
Q. 11. Calculate the energy required to excite an electron in the hydrogen atom from the first energy level to fourth energy level. Find the frequency, wave number and wave length of the light emitted when the
Electron moves back to the ground state. Ionisation energy of hydrogen atom is 1312KJ/Mole.
Q. 12. Calculate the change in position of an electron in its ground state of hydrogen atom when it is supplied with an energy of 2.04×10-18J.
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