Home / Atoms and Electrons – 1 – 2

Atoms and Electrons – 1 – 2

6. In Bohr’s theory of atom, all the orbits of the electrons are considered circular in shape. The de Broglie wavelength λn corresponding to the electron in the nth orbit is :

(a) proportional to n
(b) proportional to n2
(c) inversely proportional to n
(d) inversely proportional to n2

Answer
Answer : (a)

Explanation
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7. When an electron moves from a higher orbit to a lower orbit :

(a) emission of energy takes place
(b) absorption of energy takes place
(c) size of the atom increases
(d) either absorption or emission of energy takes place

Answer
Answer : (a)

Explanation
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8. Based on Quantum mechanical theory, the mass of holes are …………. than the electrons.

(a) larger
(b) smaller
(c) equal
(d) none of the above

Answer
Answer : (a)

Explanation
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9. The nucleus of atom is made of :

(a) protons & electrons
(b) protons & neutrons
(c) protons & krypton
(d) neutron & electrons

Answer
Answer : (b)

Explanation
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10. The forbidden charge in germanium at 0°K is :

(a) 1.21 eV
(b) 1.00 eV
(c) 0.01 eV
(d) 0.00 eV

Answer
Answer : (a)

Explanation
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