E-PolyLearning

46. To explain origin of spectral lines
a. one quantum number is sufficient
b. no quantum number is needed
c. one quantum number is not enough
d. one quantum number adds up with another one
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Answer: (c).one quantum number is not enough

47. Value of 'm' depends upon values of
a. s
b. l
c. d
d. f
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Answer: (b).l

48. Distance between two adjacent crests or troughs is called
a. wave number
b. frequency
c. wave length
d. radiation
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Answer: (c).wave length

49. Balmer series were discovered in
a. 1867
b. 1887
c. 1789
d. 1901
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Answer: (b).1887

50. Aluminium foil causes cathode rays to
a. pass through it
b. struck in it
c. distort
d. loose their identity
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Answer: (a).pass through it