Question
What do you understand by the term radioactivity?
✓
Answer
The process of self, spontaneous and random emission of a or P and y radiations from the nucleus of elements of atomic number higher than 82, is called radioactivity.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
What do you understand by the clockwise and anti clockwise moment of force?
A ray of light is incident normally on a plane glass slab. What will be (i) the angle of refraction and (ii) the angle of deviation for the ray?
Find the effective resistance in the following circuit diagrams (Fig.):
Following Fig shows piece of cardboard of uniform thickness cut into different shapes. Draw two lines to indicate the position of centre of gravity G.
State reason why is mechanical advantage less than the velocity ratio for an actual machine.
Find the kinetic energy of a car of mass 1000 kg traveling at 72 km/h.
(a) What do you understand by the term electric work?
(b) (i) Which part of an electrical appliance is earthed?
(ii) State a relation between electrical power, resistance and potential difference in an electrical circuit.
(b) (i) Which part of an electrical appliance is earthed?
(ii) State a relation between electrical power, resistance and potential difference in an electrical circuit.
State the S.I. units of electrical power and electrical energy.
(i) Define the household unit of electricity.
(ii) What is the voltage of the electricity that is generally supplied to a house?
(i) Define the household unit of electricity.
(ii) What is the voltage of the electricity that is generally supplied to a house?
State the condition when the work done by a force is positive. Explain with the help of examples.
What do you mean by electron emission?