Physics question and answers for October 20, 2023
- Q Two radioactive substances x and y initially contain equal number of nuclei x has a half life of 1hour and y has a half life of 2 hours After two...
- Q 1 1 2 1 5 3 2 1 4 2 5 The fossil bone has a 14C 12C ratio which is 2002 1 16 of that in a living animal...
- Q 6 67x 10 53 A radioactive material has mean lives of 1620 yr and 520 yr for a and emission respectively The material decays by simultaneous a and emission The...
- Q A common example of decay is 15 P 32 x y 16P 32 Then x and y stand for a electron and neutrino b positron and neutrino c electron and...
- Q 31 A radioactive sample has No active atoms at t 0 If the rate of disintegration at any time is R and the number of atoms is N then the...
- Q 0 The plot of the number N of decayed atoms versus activity R of a radioactive substance is a c N b d R R
- Q Suppose we consider a large number of containers each containing initially 10000 atoms of a radioactive material NCERT Exemplar with a half life of 1 yr After 1 yr a...
- Q potential energy of electron in the 44 In a sample of radioactive material what fraction of the initial number of active nuclei will remain after half of the half life...
- Q If in a nuclear fusion process the masses of the fusing nuclei be m and m and the mass of the resultant nucleus be M 3 then b m3 m...
- Q 22 A sample of as iodine ion was administered to a patient in a carrier consisting of 0 10 mg of stable iodine ion After 4 days 67 7 of...
- Q The volume occupied by an atom is greater than the volume of the nucleus by a factor of about a 10 c 10 0 b 105 d 10 5 2003...
- Q A radioactive element decays by emission A detector records n beta particles in first 2 seconds and 0 8 n beta particles in next 2 seconds Find the time in...
- Q 5 In a nuclear reactor the number of U235 nuclei undergoing fissions per second is 4 x 1020 If the energy released per fission is 250 MeV then the total...
- Q 11 If 20 of a radioactive element decays in 10 days then amount of original material left after 30 days is approx UP CPMT 2015 b 62 a 78 c...
- Q The phenomenon of radioactivity a increases on applied pressure b is exothermic change which increases or decreases with temperature c is nuclear process which does not depend on external forces...
- Q 0 A radioactive substance has an average life of 5 hr In a time of 5 hours a Half of the active nuclei decay b Less than half of the...
- Q 52 After a certain lapse of time the fraction of radioactive A radic polonium undecayed is found to be 12 5 of the initial quantity What is the duration of...
- Q 40 The activity of sample is 64 x10 5 Ci Its half life is 3 days The activity will become 5 10 Ci after a 12 days b 7 days...
- Q 28 In a radioactive substance at t 0 the number of atoms is 8 x 10 Its half life period is 3 years The number of atoms 1 x 10...
- Q Assume that the atomic mass of sulphur is 16 A sample of 40 g of an oxide of uranium contains 36 g of uranium Which of the following formula for...
- Q C 20 year d 3 year 29 The half life period of radium is 300 years The fractio of sample of radium that would remain after 2700 yea is a...
- Q A radioactive nucleus has specific binding energy E It emits an a particle The resulting nucleus has specific binding energy E Then a E E c E E b E...
- Q The initial mass of the radioactive substance is 10 g What is left after 2 average lives a 2 5 g c 4 87 g b 6 8 g d...
- Q COMPREHENSION charged particle of charge q and mass m is projected with initial veloc from a distance a from the fixed charge Q at an angle of a 60 w...
- Q 45 A 50 Co source is labeled 4 3 mCi but its present activity is found to be 1 71x107 Bq a What is the present activity in mci mci...
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