Question

Assertion : Electron capture occurs more often than positron emission in heavy elements.

Reason    : Heavy elements exhibit radioactivity.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

Answer

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

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

Capacity of any condenser does not depend upon :

If the current 30 A flowing in the primary coil is made zero in 0.1 sec. The emf induced in the secondary coil is 1.5 volt. The mutual inductance between the coil is

(a)  0.05 H

(b)  1.05 H

(c)  0.1 H

(d)  0.2 H    

In a cathode ray tube, what is the effect on the beam of particles if the anode voltage is increased ?
A square coil of area $10^{-2} m^2$ is kept perpendicular in a magnetic field of intensity $10^3 Wb / m ^2$. The magnitude of magnetic flux passing through the square is :
A paramagnet magnet behaves like a solenoid because both contain currents in the form of:
In the ground state in ...A... electrons are in stable equilibrium while in ...B... electrons always experiences a net force. Here, A and B refer to?
Two resistance A and B are made up of same substance. Length and radius of wire A is twice that of B. Ratio of resistances of A and B are:

For a metallic wire, the ratio V/i   (V =  the applied potential difference, i = current flowing) is

(a) Independent of temperature

(b) Increases as the temperature rises

(c) Decreases as the temperature rises

(d) Increases or decreases as temperature rises, depending upon the metal

When a photon stimulates the emission of another photon, the two photons have:

Due to the earth's magnetic field, charged cosmic ray particles

(a) Require greater kinetic energy to reach the equator than the poles

(b) Require less kinetic energy to reach the equator than the poles

(c) Can never reach the equator

(d) Can never reach the poles