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
__________ are not emitted by radioactive substances.
A α-rays
B β-rays
C Protons
D Positrons
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
A radioactive substance does not emit
A α-ray
B Proton
C Position
D β-ray
Emission of β-particles during radioactive decay of a substance is from
A Innermost shell
B Nucleus
C Outermost shell
D None of these
Chemical potential (an intensive property) of a substance is a force that drives the chemical system to equilibrium and is equal to its partial molar properties. The reatio of chemical potential to free energy of a pure substance at oconstant temperature and pressure is
A 0
B 1
C ∞
D None of these
Which of the following pollutants is not emitted during volcanic eruptions?
A SO2
B H2S
C CO
D Hydrocarbons
Which of the following is NOT a radioactive element?
A Uranium
B Plutonium
C Titanium
D Thorium

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