Atoms and Electrons – Exercise – 1

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)
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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)
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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)
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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)
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