Advertisements
Advertisements
प्रश्न
Which of the following statements is/are correct?
- α particles are photons
- Penetrating power of γ radiation is very low
- Ionization power is maximum for α rays
- Penetrating power of γ radiation is very high
विकल्प
(i) & (ii) are correct
(ii) & (iii) are correct
(iv) only correct
(iii) & (iv) are correct
Advertisements
उत्तर
(iii) & (iv) are correct.
APPEARS IN
संबंधित प्रश्न
Name the radiations which are absorbed by greenhouse gases in the earth’s atmosphere.
In a cathode ray tube, what is the function of anode?
State two properties that a substance should possess when used as a thermionic emitter.
What do you understand by the term radioactivity?
What are ‘Becquerel rays’?
Mention four properties of Becquerel rays.
The mean lives of a radioactive substance are 1620 and 405 years for β-emission and β-emission respectively. The time after which three fourth of a sample will decay if it is decaying both by β-emission and β-emission simultaneously will be ______ years.
(Take ln 2 = 0.693)
If 10% of a radioactive substance decays in every 5 years, then the percentage of the substance that will have decayed in 20 years will be ______.
Two radioactive materials A and B have decay constants 25λ and 16λ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of B to that of A will be "e" after a time `1/("a"lambda)` The value of a ______.
