Physics question and answers for October 19, 2023
- Q 6 Fig 11 1 shows how the count rate from a radioactive source varies with time 60 count rate counts s 50 40 30 20 10 20 40 60 80...
- Q A radioactive sample has decay constant 2 The rate of production of nuclei in the given sample 92N where No is the number of radioactive N nuclei in the sample...
- Q 104 A gas of monoatomic hydrogen is bombarded with a stream of electrons that have been accelerated from rest through a potential difference of 12 75 volt In the emission...
- Q A radio isotope X has a half life of 10s Find the number of active nuclei in the sample if initially there are 1000 isotopes which are falling from rest...
- Q A radioactive material decays by simultaneous emission of two particles with respective half lives 1620 and 810 years The time in years after which one fourth of the material remains...
- Q A nuclear reaction along with the masses of the particle taking part in it is as follows B C QMeV A 1 002 amu The energy Q liberated in the...
- Q 19 There are two radioactive substances A and B Decay constant of B is two times that of A Initially both have equal number of nuclei After n half lives...
- Q The graph shows some measurements of the decay rate of a sample of radio active nuclei 1281 Find the half life for this radioactive nucleus 6 2 In R R...
- Q 1 Half life of a radioactive element is the time required for the element to reduce to half of its initial concentration A t A where The rate of change...
- Q 64 based ratio of U238 and Pb226 in a sample of rock is 4 3 If the half life of U238 is 4 5 10 years then the age of...
- Q 9 A sample of a radioactive element whose half life is 30 s contains a million nuclei at a certain instant of time How many nuclei will be left after...
- Q 16 A nucleus ruptures into two nuclear parts which have their velocity ratio equal to 2 1 What will be the ratio of their nuclear size nuclear radius 1 31...
- Q When aluminium is bombarded with fast moving neutron it changes int sodium with emission of particle X according to equation 2 3 AI n 4Na X The particle X is...
- Q thorium and helium Then A nucleus of uranium decays at rest into nuclei of Re AIPMT 2015 1 The helium nucleus has less kinetic energy than the thorium nucleus 2...
- Q The rate of radioactive disintegration at an instant for a radioactive sample of half life 2 2 x 109 s is 1010 s 1 The number of radioactive atoms in...
- Q In the classic Meselson and Stahl experiment E coli are first grown in 15N enriched media 0th generation and subsequently switched to 14N media What is the ratio of 14N...
- Q 1 Summarizing ionizing radiation Fill in the chart with the characteristics of ionizing radiation For Ionizing density and Penetrating ability indicate high medium or low What is it Particle alpha...
- Q In the movie The Planet of the Apes the forbidden zone was an area presumably contaminated by the radioactive plutonium fallout from the detonation of nuclear weapons If Zera finds...
- Q 4 If the mass of a radioactive sample is increased the activity of the sample and decay constant of the sample respectively will NCERT Pg 447 1 Increase Increase 2...
- Q Iwo radioactive substances A and B initially contain equal number of nuclei A has half life of 1 hour and B has a half life of 3 hour After 6...
- Q Two samples X and Y contain equal 1 amount of radioactive substances If 16th 1 of the sample X and 256 of the sample Y remain after 8 hours then...
- Q A freshly prepared radioactive source of half life 2 h emits radiation of intensity which is 64 times the permissible safe level The minimum time after which it would be...
- Q The half life of 238U undergoing a decay is 4 5 x 10 years The activity of 1 g sample of U is a 1 23 x 10 Bq b...
- Q 1 mg radium has 2 68 x 10 8 atoms Its half life is 1620 years How many radium atoms will disintegrate from 1 mg of pure radium in 3240...
- Q 21 Compute the activity of one gram of decay constant is 1 58 x 10 18 1 number 6 02 x 1023 mole Hint R luc whose Take Avogadro s...
- Q A radioactive sample S1 having an activity 5uCi has twice the number of nuclei as another sample S2 which has an activity of 10 Ci The half lives of S1...
- Q A 280 days old radioactive substance shows an activity of 6000 dps 140 days later it s activity becomes 3000dps What was its initial activity A 20000 dps C 12000...
- Q material of half life 18 days inside the laboratory Tests revealed that the radiation was 64 times An accident in a nuclear laboratory resulted in deposition of a certain amount...
- Q 1 200 MeV 2 160 MeV In a radioactive decay let N be the number of residual active nuclei D the number of daughter nuclei R the rate of decay...
- Q Initially a black body at absolute temperature T is kept inside a closed chamber which is at absolute temperatu To Now the chamber is slightly opened to allow sun rays...
- Q 27 A body is thrown with a velocity equal to n times the escape velocity v Velocity of the body at a large distance away will be 1 ve n...
- Q 0 At a certain instant a piece of radioactive material contains 10 2 atoms The half life of the material is 30 days i Find the number of disintegrations in...
- Q Example 27 8 At time t 0 number of nuclei of a radioactive substance are 100 Att 1s these numbers become 90 Find the number of nuclei at t 2...
- Q The rate of 0 04 mol first c er reaction is s1 at 10 seconds and 0 03 mol 15 1 at 20 seconds after initiation of the reaction The...
- Q 6 Calculate the energy in fusion reaction 2H H2He n where BE of H 2 23 MeV un and of He 7 73 MeV Delhi 2016 1M
- Q If concentration of A is 0 1 M at 5 sec then from following graph the rate constant is 10 77s 30 5 77 s 5sec 2 35 15 1...
- Q The value of Z and A in the following reaction are respectively 92 U238Th Pa U RaA 1 88 230 3 90 230 a Z a a Rn Rn Po...
- Q The half life of radium is 1620 yr and its atomic weight is 226 g mol The number of atoms that will decay from its 1 g sample per second...
- Q 13 31 Suppose India has a target of producing by 2020 A D 200 000 MW of electric power 10 percent of which is to be obtained from nuclear power...
- Q 83 Which one of the following graphs could represent the distribution p E of energies E of a particles emitted from a given source 1 3 P E P E...
- Q Half life of a radioactive material is 69 3 hrs It s activity at t 0 is 50 Ci Find number of nuclei decayed between t 10 hours to t...
- Q A sample of radioactive material A that has an activity of 10mCi has twice the number of nuclei as another sample of a different radioactive material B which has an...
- Q The power obtained in a reactor using U235 disintegration is 1000 kW The mass decay of U235 per hour is 106 Amx 931 1 1 microgram 3 20 microgram 2...
- Q ET AIIMS The count rate of a Geiger Muller counter for the radiation of the a radioactive material of half life of 30 minutes decreases to 5 second 1 after...
- Q Mock Test The radioactivity of a sample is R at a time T and R at a time T If the half life of the specimen is T then number...
- Q There is a stream of radioactive sample with velocity of 8 x 103 m s If the half life of radioactive sample is 1 sec then the fraction of sample...
- Q the force assumed equal for both the friends exerted by each friend on the road increases as the man moves up Find the force when the man is at a...
- Q The mean lives of a radioactive substance are 1620 years and 405 years for a emission and emission respectively The time during which three fourth of a sample will decay...
- Q sample is The activity of a radioactive measured as No counts per minute att 0 and No e counts per minute at t 5 min The time in minute at...
- Q A radioactive source in the form of a metal sphere of diameter 10 m emits B particles at a constant rate of 6 25 1010 particles per second If the...
- Q How many a and particles are emitted when 92 U238 decays into 82Pb206 1 8a 2p 3 8a 6p 2 7a 2 4 7a 1B
- Q Which of the following reactions represents a fusion reaction 00 N e O 335U n 14 Ba Kr 3n 92 56 36 O 2 H He n O H He...
- Q Which one of the following statements about nuclear reactions is false Select one O They are often accompanied by the release of enormous amounts of energy O O O Rate...
- Q Question 14 A machine called an accelerator can be used to send gamma rays into specific par the human body to destroy cancer cells Which statement best describes this proc...
- Q Six protons and six neutrons are brought together to form a carbon nucleus but the total mass of the carbon nucleus is less than the sum of the masses of...
- Q It s estimated that a star with the mass of our sun will take about 10 billion years to consume all its core hydrogen fuel What s a reasonable estimate...
- Q A Nickel 59 has a decay constant of 2 89x10 13 s Calculate the half life B An initial sample of Nickle 59 has a mass of 14 3kg Calculate...
- Q During work with a radioactive source a worker was told that he would receive 35 mrem at a distance of 4 5 m during 20 min of work What would...
- Q Consider an unlikely equilibrium situation where Ip Id parent and daughter have the same half life What would be the total activity
- Q Use the graph below to answer the following question of substance remaining Fraction of Radioactive Nuclei Remaining 1 00 0 75 0 50 100 0 25 0 00 75 50...
- Q Due Wednesday May 4 Reminder Please fill out the course evaluation if you didn t during class Wednesday May 4 1 Rocks brought back from the Moon were estimated to...
- Q Due wednesday May Reminder Please fill out the course evaluation if you didn t during class Wednesday May 4th 1 Rocks brought back from the Moon were estimated to have...
- Q 1 A sample of Lead 214 undergoes the following decay in order Give the symbol atomic mass and atomic number of the resulting isotope a Beta Decay b Beta Decay
- Q 2 The half life of Lead 214 is 1584 s a What is the decay constant for Lead 214 b A 100 0 kg sample of Lead 214 is allowed...
- Q What is the missing product of the following Fusion reaction N H F 140
- Q It is estimated that the Sun produces around 3 846x1026J of energy per second How much mass does the Sun convert to Energy every second 3 41x1043kg 1 28x1018 kg...
- Q 1 point What is the decay rate of a sample of Nitrogen 17 if the sample has 2 53x1018 atoms and a decay constant of 0 0972 s 2 60x101...
- Q Scientist have the dream of producing enough energy in fusion reactors to power the needs of the entire country The US used about 1 37x1016J of energy in 2005 How...
- Q 9 21x1018 atoms of Titanium 44 decay until only 2 30x1018 atoms remain How many half lives has passed 2
- Q What is the decay constant for Beryllium 11 if it has a half life of 13 8s 0 0502 s 9 56s 0 0725 s
- Q What is the half life of nobellium 253 if the decay constant is 0 00714 s 0 0103s 000 280 s 97 0s 0 00494s
- Q L A sample of Lead 214 undergoes the following decay in order Give the symbol atomic mass and atomic number of the resulting isotope a Beta Decay b Beta Decay...
- Q The half life of Lead 214 is 1584 s a What is the decay constant for Lead 214 b A 100 0 kg sample of Lead 214 is allowed to...
- Q What is the product of the alpha decay of 234U 92 O 234 U 92 230Th 90 234Th 91 234 Np
- Q An unknown substance weighs 31 35kg when it is first brought to the lab After a week in the lab a technician weighs it again and finds it weighs 13...
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