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Nuclei · Question 73

AIPMT 2001MCQEasy📈 Topic in 25% papers+4−1
1

Half life of a radioactive element is 12.5 hours and its quantity is 256 g. After how much time its quantity will remain 1 g?

  1. 50 h
  2. 100 h
  3. 150 h
  4. 200 h

Answer

(2) 100 h

Solution

After n half-lives, N = N0 ( 12 )n

⇒ 1 = 256 ( 12 )n

⇒ 2n = 256 = 28

⇒ n = 8

∴ Time = n T1/2 = 8 12.5 = 100 h

Answer: (2)

Out of syllabusAIPMT 2001

Keep practising — Nuclei

2

Nuclear fission is best explained by

  1. liquid drop model
  2. Yukawa -meson theory
  3. independent particle model of the nucleus
  4. proton-proton cycle
AIPMT 2000
3

For the given reaction, the particle X is 6C11 5B11 + + + X

  1. neutron
  2. anti neutrino
  3. neutrino
  4. proton
Out of syllabusAIPMT 2000
4

The relation between and T1/2 is ( T1/2 half-life)

  1. T1/2 = 2
  2. T1/2 2 =
  3. T1/2 = 1
  4. ( + T1/2) = 2
Out of syllabusAIPMT 2000

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