Question
Radioactivity is:

Answer

  1. All of the above.

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

A sphere can roll on a surface inclined at an angle $\theta$ if the friction coefficient is more than $\frac{2}{7}\text{g}\tan \theta.$ Suppose the friction coefficient is $\frac{1}{7}\text{g}\tan \theta.$ If a sphere is released from rest on the incline:
  1. It will stay at rest.
  2. It will make pure translational motion.
  3. It will translate and rotate about the centre.
  4. The angular momentum of the sphere about its centre will remain constant.
A proton and an $\alpha-$particle are accelerated through a potential difference of $100 V.$ The ratio of the wavelength associated with the proton to that associated with an $\alpha-$particle is
An alternating current of frequency $200$ rad/sec and peak value $1A$ as shown in the figure, is applied to the primary of a transformer. If the coefficient of mutual induction between the primary and the secondary is $1.5 H,$ the voltage induced in the secondary will be
When radiation is incident on a photoelectron emitter, the stopping potential is found to be $9$ volts. If $e/m$ for the electron is $1.8\times 10^{11} \mathrm{Ckg}^{-1}$ the maximum velocity of the ejected electrons is
Magnetic field in a current carrying solenoid is B. If length of the solenoid and current flowing through the solenoid is doubled, keeping the number of turns same, the magnitude of magnetic field in the solenoid will be:
A short bar magnet with its north pole facing north forms a neutral point at $P$ in the horizontal plane. If the magnet is rotated by $90^{\circ}$ in the horizontal plane, the net magnetic induction at $P$ is $($Horizontal component of earth's magnetic field $=B_H)$
(USS 133) Indium impurity in germanium makes(a) N-type(b) P-type(c) Insulator(d) Intrinsic
       
Inductive reactance of a coil is expressed in.
In which of the following, emission of electrons does not take place?
A transformer increases ac voltage supply from 220 V to 2200 V. If there are 2000 turns in the second- ary coil, then number of turns in the primary coil is: