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Paragraph: The Rutherford - Royds experiment : The following experiment dates from 1909. The apparatus is shown below. The thin - walled glass flask, containing radon (an emitter), is placed inside the thick-walled glass apparatus. The apparatus is evacuated, and the valve to the vacuum pump is then closed. After a week, additional mercury is added to the apparatus until the liquid level reaches the bottom of the tub

Options

  1. A0.75 mole
  2. B0.68 moles
  3. C0.5 mole
  4. D0.375 mole

Correct answer

A. 0.75 mole

Step-by-step solution

n_ R n = 222 222 =1 mole ; N_t= N₀ 2^ t t_ 1 / 2 = N₀ 2^ 7 / 3.5 = N₀ 4 Number of nuclei decayed = 3 ~N ₀ 4

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