Physics question and answers for October 20, 2023
- Q 7 The phenomenon of radioactivity is associated with 1 Decay of nucleus 2 Fussion of nucleus 3 Emission of electrons or protons 4 Rearrangement in the extra nuclear electron
- Q 1 A radioactive substance is being produced at a constant rate of 200 nuclei s The decay constant of the substance is 1 s After what time the number of...
- Q 22 The radioactivity of an old sample of whisky due to tritium half life 12 5 years was found to be only about 4 of that measured in a recently...
- Q At a given instant say t 0 two radioactive A B have equal activities The substance RB ratio RA of their activities after time t is e 3t If half...
- Q After a perfectly elastic collision of two identical balls one of which was initially at rest the velocities of both the balls are non zero The angle 0 between the...
- Q A black body which is at a high temperature T K emitted thermal radiation at the rate of E watt m The thermal radiation emitted by a body of emissivity...
- Q 238U decays in 14 steps that together constitute the net reaction 238 U 206 Pb 60 8 He The sign represents some unknown particle particles Take 1 amu 931 5...
- Q In a radioactive reaction an unstable nucleus A dis integrates into a stable nucleus B But A is generated at a constant rate of q nucleus per second Then at...
- Q The binding energy per nucleon of deuteron and d par respectively The energy released in the following reaction will be 1H 1H 2He4 Q x1 x2 x2 x1 O 2...
- Q At any instant the ratio of the amount of radioactive substances is 2 1 If their half lives be respectively 12 and 16 hours then after two days what will...
- Q 4 BA 40 40 If 10 of a radioactive material decays in 5 days then the amount of original material left after 20 days is approximately 1 60 2 65...
- Q 3 250 years 4 100 years 10044 The rate of disintegration of a fixed quantity of a radioactive 6 fafter that are a face element can be increased by 1...
- Q A radioactive sample contains two different types of radioactive nuclei A with half life 5 0 days and B with half life 30 0 days Initially the decay rate of...
- Q 10 A radioactive nucleus X decays to a nucleus Y with a decay constant x 0 1s X Y further decays to a stable nucleus Z with a decay constant...
- Q The half life of a radioactive nucleus 100 days The time interval h b between t time to when half of it has decayed and the time when three fourth...
- Q Determine the factor by which amplitude of an oscillation decreases after 5 cycles whe he period of oscillation changes from 1 500 s to 1 502 s due to application...
- Q Two radioactive materials X and X have decay constants 10 and respectively If initially they have the same number of nuclei if the ratio of the number of nuclei of...
- Q A radioactive sample has a half life of 40 seconds When its activity is measured 80 secon after the begining it is found to be 6 932 x 10 8...
- Q ction E Nuclear Fission and Fusion 92U 235 nucleus absorbs a slow neutron and undergoes fission into 54X139 and 38 Sr94 nuclei The other particles produced in this fission process...
- Q Velm B M M Two radioactive sources A and B initially contain equal number of radioactive atoms Source A has a half life of 1 hour and source B has...
- Q It is now believed that protons and neutrons which constitute nuclei of ordinary matter are themselves built out of more elementary units called quarks A proton and a neutron consist...
- Q A photon with an energy of 4 9 eV ejects photoelectrons from tungsten When the ejected electron enters a constant magnetic field of strength B 2 5 mT at an...
- Q 1 Probability of decay of a particular nucleus of substance Z in next 1 hour is 3 of decay of a nucleus of same substance 1 1 A In next...
- Q Compare between Stimulated Emission and Spontaneous Emission Higher energy as a total output Spontaneous Emission Stimulated Emission Need energy to starts Needs no energy to starts Follows Boltzman s distribution
- Q Half lives of two radioactive substances A and Bare 20 hours and 40 hours respectively Initially the sample of A and B have equal number of nuclei The ratio of...
- Q The rate of disintegration of a radioactive substance falls from 800 decay min to 100 decay min in 6 hours The half life of the radioactive substance is wala man...
- Q FINDING HALF LIFE OF RADIOACTIVE NUCLEI The half life of a radioactive isotope X is 50 years It decays to another element Y which is stable The two elements X...
- Q Two identical samples same material and same amount initially P and Q of a radioactive substance having mean life T are observed to have activities Ap Aq respectively at the...
- Q In one dimension a random walker takes a step with equal probability to the left or right What is the probability that the walker returns to the starting point after...
- Q Half lives of two radioactive substances A and B are 20 hours respectively Initially the sample of A and B have equal number of nuclei The ratio of remaining number...
- Q If activity of a radioactive substance is Ro at time t 0 and R at t 10 hours then the time in hours at which the activity reduces to half...
- Q 1 A radioactive sample of half life 23 1 days is 2 disintegrating its in 15th to 16th days will be Take e0 03 1 03 a 5 b 1...
- Q 175 Which of the following fusion reactions will not result in the net release of energy 1 Li Li 3 2C C a 1 b 2 2 He He 35...
- Q A fresh radioactive sample is given at t 0 Its decay fraction are at t instant and L instant Its mean life is 1 4 4 n2 2 n4 424...
- Q A radioactive sample S1 having an activity of 5uCi has twice the number of nuclei as another sample S2 which has an activity of 10uCi The half lives of S1...
- Q A nuclear reactor takes 30 days to use upto 2 kg of fuel of 92U235 and each fission gives 185 MeV of usable energy The power output of this reactor...
- Q tially 98 grams of radioactive substance was present After 2 hours the mass had decreased by 6 If the rate of decay is proportional to e amount of the substance...
- Q A radioactive isotope A with a half life of 1 25 x 10 year decays into B which is stable A sample of rock from a planet is found to...
- Q A radio nuclide with half life T days emits p particles of average kinetic energy E joule This radionuclide is used as source in a machine which generates electric energy...
- Q 38 The total radiative power emitted by spherical blackbody with radius R and temperature T is P If the radius if doubled and the temperature is halved then the radiative...
- Q At 500 K equilibrium constant Kc for the following reaction is 5 H2 g 1 12 g HI g 2 What would be the equilibrium constant K for the reaction...
- Q The half life for beta decay of cesium 137 is 30 years A water sample is found to contain 10 ppm cesium 137 How many months would pass before the...
- Q 39 A certain radioactive isotope has a half life of 2 days If 8 kg of the isotope is placed in sealed container how much of the isotope will be...
- Q The age of an organic material is usually determined by measuring its 14C content carbon dating The ratio of the number of stable isotope of 14C atoms present to the...
- Q Which statement about radioactive radiations is true A Speed of a particles is a characteristic property B Speed of particles is a characteristic property C Speed of y photon is...
- Q The half life of a radioactive substance is 30 minutes The time in minutes taken between 40 decay and 85 decay of the same radioactive substance is NEET Phase 2...
- Q 38 Radioactive nuclei X and Y disintegrate into Z with half lives to and 2t respectively Initial number of both X and Y No Time at which rates of disintegration...
- Q 47 A freshly prepared sample contains 16x1020 radioactive nuclei whose mean life is 10 0 seconds The activity of the sample just after 4 half lives time is In 2...
- Q 45 In a certain nuclear reactor a radioactive nucleus is being produced at a constant rate 1000 s The mean life of the radionuclide is 40 minutes At steady state...
- Q Initially 500 milligrams of a radioactive substance were present After 3 days the mass had decreased by 145 milligrams If the rate of decay is proportional to the amount of...
- Q 6 The ratio between total acceleration of the electron in singly ionized helium atom and hydrogen atom both in ground state is a 1 c 4 b 8 d 16
- Q 3 A radioactive substance X decays into another radioactive substance Y Initially only X was present Ax and y are the disintegration constants of X and Y Nx and Ny...
- Q 3 A radioactive isotope A decays into another isotope B which has a half life equal to 1 2 of that of A Both isotopes emit a particles during their...
- Q The activity of a radioactive element decreased to one third of original activity Io in 9 yr After further 9 yr its activity will be A Io B 10 Your...
- Q Question No 33 Single Correct ENGLISH A radioactive element X disintegrates into a stable element Y with half life 2 year A fresh sample of X is available at t...
- Q 113 90 of the active nuclei present in a radioactive sample are found to remain undecayed after 1day The percentage of the undecayed nuclei left after two days will be...
- Q Maximum kinetic energy of a particle Calculate the maximum kinetic energy of the beta particle emitted in the following decay process 12N12C e 12C Take atomic mass of 12N 12...
- Q 1 A radioactive simultaneously O O X 2 X X 4 nucleus can decay by two different processes which have decay constant Aanda The effective decay constant of the nuclide...
- Q Moderate 4 1 00 16 Pick out the unmatched pair from the following Moderator Heavy water Nuclear fuel C to C Pressurized water reactor water as the heat exchange system
- Q U 92 A fission reaction is given by 226 U 94 140 Xe 39 Sr x y 54 where x and y are two particles Considering 226U to be 92...
- Q 4 Increases but mass number remains same 157 Activity of a radioactive substance decays from 8000 becquerel to 4000 becquerel in 5 days Activity of the substance after next 10...
- Q Springboard diving is a water sport in which a diver has to jump from a springboard that is situated at a certain height before diving into a swimming pool The...
- Q Radioactive material A has decay constant 8 X and material B has decay constant X Initially they have same number of nuclei After what time the ratio of number of...
- Q Define the thickness of the water shield needed to reduce the intensity of monochromatic y radiation with the photon energy of 200 keV by a factor of 10 The linear...
- Q View In English The half life of a radioactive isotope X is 25 years It docays to another element Y which is stable The two elements X and Y were...
- Q Energy released in the fission of a single 92U235 nucleus is 200 MeV The fission rate of a 92U235 fuelled reactor operating at a power level of 5W is 1...
- Q 2 For a radioactive material half life is 10 minutes If initially there are 600 number of nuclei the time taken in minutes for the distintegration of 450 nuclei is...
- Q Two radioactive materials X and X have respectively If decay constants 5A and initially they have the same number of nuclei then the ratio of the number of nuclei of...
- Q Q 39 A nucleus with mass number 220 initially at rest emits an a particle If the Q value of the reaction is 5 5 MeV calculate the kinetic energy...
- Q A certain radioactive material is known to decay at a rate proportional to the amount present If initially there are 100 milligrams of the material present and if after two...
- Q 46 A sample of radioactive element has a mass of 10 gm at an instant t 0 The approximate mass of this element in the sample after two mean lives...
- Q 28 A radioactive source in the form of a metal sphere of diameter 3 2 x 10 3 m emits B particles at a constant rate of 6 25 1010...
- Q The mean lives of a radioactive substance are 1600 years and 400 years for a emission and emission respectively The time during which three fourth of a sample decays if...
- Q A Li target is bombarded with a proton beam currentof 10 Amp for 1hr to produce Be of activity 1 8 x 10 disc sec Assuming that one Be radioactive...
- Q c In 2 s 2 A radioactive isotope is being produced at a constant rate X Half life of the radioactive substance is Y After some time the number of...
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