Advertisements
Advertisements
प्रश्न
When is said to be the nucleus unstable?
Advertisements
उत्तर
The nucleus is said to be unstable when radiations (alpha, beta, gamma rays) are emitted by the nucleus.
APPEARS IN
संबंधित प्रश्न
Answer the following questions based on a hot cathode ray tube
Name the charged particles
State three factors on which the rate of emission of electrons from a metal surface depends
Why do Free electrons not leave the metal surface on their own
State the energy conversion taking place in a cathode ray tube
State any two precautions to be taken while handling radioactive substances
A nucleus `""_11^24Na` emits a beta particle to change into Magnesium (Mg)
(i) Write the symbolic equation for the process.
(ii) What are numbers 24 and 11 called?
(iii) What is the general name of `""_12^24Mg `with respect to `""_11^24Na` ?
What are isobars?
What kind of change takes place in a nucleus when a β -particle is emitted?
Why should a radioactive substance not be touched by hands?
State two properties that a substance should possess when used as a thermionic emitter.
In a cathode ray tube state the purpose of the fluorescent screen.
In a cathode ray tube state. How is it possible to increase the rate of emission of electrons.
What do you understand by the term radioactivity?
What are ‘Becquerel rays’?
Two radioactive nuclei are represented by xAp and yAq and when p and q are mass numbers and x, y are the atomic number. How can the products be represented, i .e., what are the new values of p, q. x and y after the emission of an α-particle and a β-particle from A and B respectively.
