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Atoms and Electrons – 1 – 8

36. What is the de Broglie wavelength of neutrons at room temperature ?

(a) 0.145 nm
(b) 0.82 nm
(c) 0.64 nm
(d) 4.23 nm

ANSWER

EXPLANATION

37. Germanium has a :

(a) Diamond cube (dc) structure
(b) Simple cube (sc) structure
(c) Face centered cube (fcc) structure
(d) Body centered cube (bcc) structure

ANSWER

EXPLANATION

38. The electron mobility is greater in :

(a) Germanium
(b) Silicon
(c) Gallium arsenide
(d) Bakelite

ANSWER

EXPLANATION

39. The relative distance of the electron from the nucleus is same as :

(a) The relative distance between Earth and Moon
(b) The relative distance between Sun and Earth
(c) The relative distance between Earth and Pluto
(d) The relative distance between Sun and Pluto

ANSWER

EXPLANATION

40. One part of donor impurities to 108 parts of germanium :

(a) Increases the conductivity of the crystal twofold
(b) Increases the conductivity of the crystal fourfold
(c) Increases the conductivity of the crystal eightfold
(d) Increases the conductivity of the crystal tenfold

ANSWER

EXPLANATION

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