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
In beta decay what is emitted?
A Electron
B Proton
C Neutron
D All of the above
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
Out of the following, which is not emitted by radioactive substance?
A Electrons
B Electromagnetic radiations
C Alpha particles
D Neutrons
__________ are not emitted by radioactive substances.
A α-rays
B β-rays
C Protons
D Positrons
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
β-rays emission in radioactive disintegration is always accompanied by the emission of
A γ-rays
B α-rays
C Neutrons
D None of these
The atomic number of a radioactive element is not changed, when it emits __________ rays.
A α
B β
C γ
D α & β
124λ তরঙ্গদৈর্ঘ্যের এক রঙা এক্সরে একটি কার্বণ ব্লক দ্বারা বিক্ষিপ্ত হয়। 180° তে এক্সবের বিক্ষিপ্ত বিকিরণের তরঙ্গদৈর্ঘ্যের মান নির্ণয় কর।(A monochromatic X-rays of wavelength 0.124λ is scattered by a carbon block. Find the wavelength of X-rays scattered through 180°) 
A 0.0484 λ
B 0.1724 λ
C 0.0756 λ
D 0.0242 λ
E 0.0968 λ
Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material?
A Thorium
B Radium
C Plutonium
D Radan

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