MCQ
One curie is equal to:
  • $3.7 \times 10^{10}$ Disintegration$/ \sec.$
  • B
    $3.2 \times 10^8$ Disintegration$/ \sec.$
  • C
    $2.8 \times 10^{10}$ Disintegration$/ \sec.$
  • D
    None of these.

Answer

Correct option: A.
$3.7 \times 10^{10}$ Disintegration$/ \sec.$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

The junction diode in the following circuit requires a minimum current of 1 mA to be above the knee point (0.7 V) of its I-V characteristic curve. The voltage across the diode is independent of current above the knee point. If $V_B=5 V$, then the maximum value of R so that the voltage is above the knee point, will be
An object is placed at a distance of $30\,cm$ from a convex lens of focal length $20\,cm$ on the other side of the lens a convex mirror is placed at its focus such that the image formed by combination coincides with the object itself. Find the focal length of convex mirror.......$cm$
The electric fields of two plane electromagnetic plane waves in vacuum are given by

$\overrightarrow{\mathrm{E}}_{1}=\mathrm{E}_{0} \hat{\mathrm{j}} \cos (\omega \mathrm{t}-\mathrm{kx})$ and

$\overrightarrow{\mathrm{E}}_{2}=\mathrm{E}_{0} \hat{\mathrm{k}} \cos (\omega \mathrm{t}-\mathrm{ky})$

At $t=0,$ a particle of charge $q$ is at origin with a velocity $\overrightarrow{\mathrm{v}}=0.8 \mathrm{c} \hat{\mathrm{j}}$ ($c$ is the speed of light in vacuum). The instantaneous force experienced by the particle is 

A man runs towards mirror at a speed of $15\,m/s.$What is the speed of his image.....$m/s$
The magnetic field in a plane electromagnetic wave is $\mathrm{B}_y=\left(3.5 \times 10^{-7}\right) \sin \left(1.5 \times 10^3 \mathrm{x}+0.5\right.$ $\left.\times 10^{11} \mathrm{t}\right) \mathrm{T}$. The corresponding electric field will be
Half life of a radioactive substance is $T$. The time taken for all the nuclei to disintegrate will be
A rectangular tank of depth $8$ meter is full of water ($\mu = 4/3$), the bottom is seen at the depth
A capacitor is connected to a battery of voltage $V$. Now a di electric slab of dielectric constant $k$ is completely inserted between the plates, then the final charge on the capacitor will be

(If initial charge is $q_{0}$ )

A point object is placed at a distance of $25\, cm$ from a convex lens of focal length $20\, cm$. If a glass slab of thickness $'t'$ and refractive index $1.5$ is inserted between the lens and object, then image is formed at infinity. The thickness is....$cm$
X-rays region lies between