MCQ
$1$ Curie is equal to
  • A
    $3\times 10^7$ disintegrations/sec
  • B
    $3.7 \times 10^7$  disintegrations/sec
  • C
    $5\times 10^7$ disintegrations/sec
  • $3.7\times 10^{10}$ disintegrations/sec

Answer

Correct option: D.
$3.7\times 10^{10}$ disintegrations/sec
$3.7\times 10^{10}$ disintegrations/sec

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Mark the correct options:
  1. An atom with a vacancy has smaller energy that a neutral atom.
  2. $K\ X-$ray is emitted when a hole makes a jump from the $K$ shell to some other shell.
  3. The wavelength of $K\ X-$ray is smaller than the wavelength of $L\ X-$ray of the same material.
  4. The wavelength of $\text{K}_\alpha$ $X-$ray is smaller than the wavelength of $\text{K}_\beta$ $X-$ray of the same material.