Related Questions

The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then
A $${\frac{3}{4}^{{\text{th}}}}$$ of it will disintegrate in two months
B It will completely disintegrate in two months
C It will completely disintegrate in four months
D $${\frac{l}{8}^{{\text{th}}}}$$ of it will remain intact at the end of four months
Out of the following, which is not emitted by radioactive substance?
A Electrons
B Electromagnetic radiations
C Alpha particles
D Neutrons
Which among the following is a positively charged particle emitted by a radioactive element?
A Beta ray
B Alpha ray
C Cathode ray
D Gamma ray
Beta rays emitted by a radioactive material are
A The electrons orbiting around the nucleus
B Charged particles emitted by nucleus
C Neutral particles
D Electromagnetic radiations
240 radioactive grams of goo loses half its radioactivity every 10 days. How many grams of radioactive goo is left in 40 days?
A 120
B 60
C 15
D none
Radiation energy is emitted by all the substances, which are above
A 0°K
B 0°C
C 100°C
D Room temperature
Radioactive substances present in the polluted water stream can be removed by
A Biological oxygen treatment
B Coagulation and filtration
C Adsorption in ion exchange materials
D None of these
Those substances which have so far not been resolved by any means into other substances of simpler form are called
A Atoms
B Compounds
C Elements
D Molecules
The atomic number of a radioactive element is not changed, when it emits __________ rays.
A α
B β
C γ
D α & β
Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.
A Grey
B Black
C Opaque
D White

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