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

EXPLANATION

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

EXPLANATION

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

EXPLANATION

9. The nucleus of atom is made of :

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

ANSWER

EXPLANATION

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

EXPLANATION

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