Physics question and answers for October 16, 2023
- Q c The masses of neutron and proton are 1 0087 amu and 1 0073 amu respectively If the neutrons and protons combine to form a helium nucleus alpha particles of...
- Q Example 13 6 Calculate the energy required to remove the leas 40 tightly bound neutron in Ca Given that 20 Mass of 20 Ca 40 39 962589 amu Mass of...
- Q In the options given below let E denote the rest mass energy of a nucleus and n a neutron The correct option is A E U E 31 E Y...
- Q 13 A diatomic gas molecule consists of two atoms of mass m separated by a fixed distance d and rotating about an axis as indicated in the figure Assuming that...
- Q Which one of the following statements about uranium is correct a 235 U is fissionable by thermal neutrons b Fast neutrons trigger the fission process in 235 U c 235...
- Q Slightly greater than T Consider a nuclear reaction A A A3 A4 If B B B3 and B4 are the binding energie of the nuclei A A A3 and A4...
- Q 92 In a fission reaction 236 U 117X 117Y n n the binding energy per nucleon of X and Y is 8 5MeV whereas of 236U is 7 6 MeV...
- Q Magnetic moment of an electron in nth orbit of hydrogen atom is neh a c m meh 2 n b neh 4m meh d 59 4tn m mass of electron...
- Q An alpha particle is projected from infinity w ith a velocity V alpha towards the nucleus of an atom having atomic number Z Find i C losest distance of approach...
- Q Identify the incorrect relationship 2 r 2 2 Number of revolutions of an electron per Vn 2 r 1 Number of waves in an orbit n second in nth orbit...
- Q 65 In the given nuclear reaction A B C D E represent 92 U 238aBZADYC92X234 a A 234 B 90 C 234 D 91 e b A 234 B 90...
- Q Two radioactive substances A and B whose half lives are 2 years and 8 years respectively Initially 80 gm of A and 20 gm of B is taken The time...
- Q 1 If 10 of a material decays in 5 days then the amount of original material left after 20 days is approximately 1 75 3 55 2 65 4 25...
- Q a 0 5 10 4 c 5 10 2 b 0 5 x 1012 d 5 10 4 20 The energy in MeV is released due to transformation of 1kg...
- Q ose the correct answer If the size of nucleus is in the range of 10 15 m 10 14 m is scaled up to the tip of sharp pi Assume...
- Q 1 The mass of a Li nucleus is 0 042u less than the sum of the masses of all its nucleons The binding energy per nucleon of Li nucleus is...
- Q A nucleus of nuclear density o disintegrates into two daughter nuclei with masses in the ratio 8 27 density of the smaller nucleus is 02 02 5 P 8 27P
- Q If the temperature of the gas molecules is increased then which is an incorrect statement about Maxwell Boltzmann distribution curve O The most probable speed increases The fraction of molecules...
- Q A certain radioactive isotope has a half life of approximately 1750 years How many years to the nearest year would be required for a given amount of this isotope to...
- Q 0 some radioactive gas is injected into a sealed vessel At time T some more of the gas is injected into the vessel Which one of the following graphs best...
- Q 5 An atomic particle of mass 3 x 10 24 g moving with a velocity of 106 cm s makes a head on collision with a nucleus of mass 15...
- Q 8 An a particle accelerated through V volt is fired towards a nucleus Its distance of closest approach is r If a proton accelerated through the same potential is fired...
- Q Pick out the unmatched pair from the following Question Type Single Correct Type 1 Moderator Heavy water 2 Nuclear fuel 92U235 3 Safety rods Carbon Roactor is critical Multiplication factor...
- Q At a given instant say t 0 two radioactive substance A B have equal activities The ratio RB RA of their activities after time t is e 3t If half...
- Q In a nuclear reactor a neutron of high speed 104 m s1 collides elastically with a light nuclei of deuterium at rest The collision results in loss of KE of...
- Q DCE 2007 10 Binding energy per nucleon plot against the mass number for stable nuclei is shown in the figure Which curve is correct a A c C Binding energy...
- Q In a nuclear reactor an element X decays to a radioactive element Y at a constant rate 10 5 atoms per sec Each decay releases 100MeV energy Y immediately decays...
- Q Study the nucleus Na A 25 Z 11 using the shell model and determine the spin parity in the excited state as a result of moving one of the unpaired...
- Q 170 If radius of the Al nucleus is taken to be R 12 Al then the radius of 125 Te nucleus is nearly 2015 53 a c 3 RAI 1...
- Q 30 In a cyclotron protons are to be accelerated Radius of its D is 60 cm and its oscillator frequency is 10 MHz What will be the kinetic energy of...
- Q Therefore the expected mass of O nucleus 8 x 2 01593 u 16 12744 u The atomic mass of 16 O found from mass spectroscopy experiment s seen to be...
- Q Hydrogen atoms in states of high quantum number have been created in the laboratory and observed in space They are called Rydberg atoms a Find the quantum number of the...
- Q Objective Questions 1 For uranium nucleus how does its mass vary with volume a m x V c mx V b m x 1 V d mx V2 no ium...
- Q The mass of proton is 1 0073 u and that of neutron is 1 0087 u u atomic mass unit The binding energy of He is Given helium nucleus mass...
- Q 19 Two radioactive nuclei P and Q in a given sample decay into a stable nucleus R At time t 0 number of P species are 4N and that of...
- Q 2 6 A nucleus moving with a velocity v emits an a particle Let the velocities of the a particle and the remaining nucleus be v and v and their...
- Q Q3 An electron in an atom which is freely radiating power behaves as a damped simple harmonic oscillator If the radiated power is given by P q w A 12...
- Q samples A and B with time is shown in figure dN dt B ve Which of the following statements is true a Decay constant of A is greater than that...
- Q The figure indicates the energy level diagram of an atom and the origin of six spectral lines in emission e g line no 5 arises from the transition from level...
- Q 63 Mass numbers of the elements A B C and D are 30 60 90 and 120 respectively The specific binding energy of them are 5 MeV 8 5 MeV...
- Q The following fusion reaction akes place H H2H 6 m 3 27Mer 2 If 2 kg of deuterium is subjected to given reaction the energy released is used to light...
- Q A heavy nucleus X of mass number 240 and binding energy per nucleon 7 6 MeV is splitted into two fragments Y and Z of mass numbers 110 and 130...
- Q For CE transistor amplifier the audio signal voltage across the collector resistance of 2 kg is 4 V If the current amplification factor of the transistor is 100 and the...
- Q a tential energy of hud A Find the binding energy of an electron in the ground state of a hydrogen like atom in whose spectrum the third Balmer line is...
- Q The graph between 2 and r radial distance is shown below This represents 0 2n orbital 19 B 3s orbital C 2s orbital JEE Mains onlin D 1s orbital
- Q 2 An electron with kinetic energy 5 eV is incident on a hydrogen atom in its ground state The collision a must be elastic b may be partially elastic c...
- Q Half life 2 and completion time T of the reaction Ak 0 001 Mmin k 0 001 Mmin 2B are if initial concentration of A is 1M 1 500 min...
- Q The distance between electron and proton in a hydrogen atom is 0 53 A Find the speed and frequency of revolution of electron round the proton m 9 1 10...
- Q 1 137 222 6A a 6 3 c 4a 3 84B2 0 In this reaction how many a and particles are emitted b 3a 4 d 3 6 Y The...
- Q 45 A liquid having small depth but large volume in forced by an applied pressure p above it to escape with velocity through a hole below If e is given...
- Q A proton and an a particle move in circular paths in a transverse magnetic field If speed of proton is two times that of a particle the ratio of their...
- Q 51 When a hydrogen atom emits a photon of energy 12 1 eV its orbital angular momentum changes by where h is Planck s constant 1 3 3h 4 T...
- Q If M M and M are the rest masses of electron proton and hydrogen atom in the ground state with energy 13 6 eV respectively which of the following is...
- Q 52 If you were able to isolate two identical charged particles of mass m from all external forces a what would the charge of the particles have to be in...
- Q The half life of a radioactive isotope X is 50 years It decays to another element Y which is stable The two elements X and Y were found to be...
- Q An a Rutherford scattering experiment when a projectile of charge z and mass M approaches a target nucleus of charge z and mass M the distance of closest approach is...
- Q Fission of nuclei is possible because the binding energy 2005 per nucleon in them A a increases with mass number at high mass numbers b decreases with mass number at...
- Q As the electron in Bohr orbit of hydrogen atom passes from state n 2 to n 1 the kinetic energy K and potential energy U change as 2015 a K...
- Q Curium 96 Cm 248 decays to plutonium 4 Pu244 emitting an a particle Assume that a particle was initially at the periphery of nucleus as shown in the following figure...
- Q 1 AL Five equal resistances each of resistance R are connected as shown in the Figure A battery of voltage V is connected between A and B The current flowing...
- Q Which shorter mean life dN dt A C B A C Same for all C B A t
- Q 5 Mark out the incorrect statement a A free neutron can transform itself into photon b A free proton can transform itself into neutron c In beta minus decay the...
- Q Which of the following parameters is same fo electron in all hydrogen like atoms and ions i their ground states 1 Radius Speed 3 Energy of atom Speed Energy 4...
- Q unstable nucleus of mass M initially M at rest emits an element of mass The Q 50 value of this nuclear reaction is E What will be kinetic energy of...
- Q Two identical metal plates show photoelectric effect by a light of wavelength falling on plate A and A on plate B A2 The maximum kinetic energy is 1 2K Kg...
- Q m In process of nuclear fission of 1 g uranium the mass lost is 0 90 mg The efficiency of power house s fission reactor is 20 To obtain 400...
- Q 1 If the frequency and intensity of light source are both doubled then the saturation photocurrent remains the same 2 A non monochromatic light is used in an experiment on...
- Q A hydrogen sample is prepared in a particular excited state A Photons of energy 2 55 eV get absorbed into the sample to take some of electrons to the further...
- Q The ratio of molecular mass of two radioactive substances is 3 2 and the ratio of their decay constants is 4 3 Then the ratio of their initial activity per...
- Q A certain radioactive element disintegrates with a decay constant of 7 9 x 10 10 sec At a given instant of time if the activity of the sample is equal...
- Q 33 The K wavelength emitted by an atom of atomic number Z 61 is The atomic number for an atom that emits K radiation for wavelength is 4 1 120...
- Q 7 If the energy in the first excited state in hydrogen ator is 23 8 eV then the potential energy of a hydroge atom in the ground state can be...
- Q 60 How many elementary particles are emitted whe C transforms to N 6 1 One 3 Three 2 Two 4 Four
- Q A nucleus with mass number 220 initially at rest emits an a particle If the Q value of the reaction is 5 5 MeV the K E of the a...
- Q 2 An alpha nucleus of energy mv bombards a heavy nuclear target of charge Ze Then the distance of closest approach for the alpha nucleus will be proportional to 1...
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