Download Test Paper No. 12 (Physics)

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Transcript
TEST NO. 12
MAXIMUM MARKS : 20
1. What was the main conclusion of Rutherford’s experiment on the
(1)
scattering of alpha particles by thin foils?
2. Define impact parameter.
(1)
3. What are the values of impact parameter for head on collision?
(1)
4. Why do we use gold in Rutherford’s alpha particle scattering experiment?
(1)
5. What is Bohr’s quantization condition for the angular momentum
(2)
of an electron in an atom?
6. Define distance of closest approach and derive an expression for it.
(3)
7. Prove that the radius of the nth Bohr orbit of an atom is directly
(3)
proportional to n2, where n is principal quantum number.
8. State Bohr’s postulates.
(3)
9. Using Bohr’s postulates derive an expression for the total energy of
(5)
an electron in the nth orbit of an atom. What does negative value
of this energy signify?