The `alpha-` rays have more penetrating power than `gamma-` rays.

penetrating power of gamma - rays is-

The least penetrating power ray is

Which of the following statements are correct ? (i) All isotopes are radioactive (ii) Emission of beta -rays is accompanied by the emission of anti neutrinos (iii) Alpha particles have a mass number of 4 and carry a charge of +2 (iv) gamma -rays have a higher penetrating power than alpha -rays

Ionising power of the gamma rays

Assertion (A): beta- particles have greater penetrating power than alpha- rays but less than gamma- rays. Reason (R) : beta- particles are lighter than alpha- particles but heavier than gamma.

Assertion (A): beta- particles have greater penetrating power than alpha- rays but less than gamma- rays. Reason (R) : beta- particles are lighter than alpha- particles but heavier than gamma.

Assertion (A) : beta -particles have greater penetrating power than alpha -rays but less than gamma -rays Reason (R ) : beta -particles are lighter than alpha -rays but heavier than gamma -rays

Assertion (A): gamma- rays have very high penetrating power. Reason (R) : gamma- rays are high - energy electromagnetic radiations.

Assertion (A): gamma- rays have very high penetrating power. Reason (R) : gamma- rays are high - energy electromagnetic radiations.