Physics question and answers for October 21, 2023
- Q 8. When light travels from air to an unknown material at an incident angle of 50, it is refracted at an angle of 30. What will be the critical angle...
- Q Light of wavelength 631 nm passes through adiffraction grating having 299 lines/mm.For related problem-solving tips and strategies, youmay want to view a Video Tutor Solution of Width ofa grating spectrum.Part...
- Q Red light of wavelength 633 nm from a helium-neon laser passes through a slit 0.330 mm wide. The diffraction pattern is observed on a screen 3.15 m away. Define the...
- Q A massless elastic cord (that obeys Hooke's law) will break if the tension in the cord exceeds Tmax. One end of the cord is attached to a fixedpoint, the other...
- Q A ray of light travels from air into another medium, making an angle of ?? = 45.0 with the normal as in the figure below.(a) Find the angle of refraction...
- Q A photon with wavelength ? = 0.0580 nm is incident on an electron that is initially at rest.If the photon scatters in the backward direction, what is the magnitude of...
- Q During takeoff, the sound intensity level of a jet engine is 170 dB at a distance of 28 m.Part AWhat is the sound intensity level at a distance of 1.0...
- Q One of the wavelengths of light emitted by hydrogen atoms under normal laboratory conditions is at ? = 656.3 nm in the red portion of the electromagnetic spectrum. In the...
- Q In a two slit experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the slits. If the screen is moved by a distance of...
- Q A radio station utilizes frequencies between commercial AM and FM. What is the frequency (in megahertz) of a 11.60 m wavelength channel? MHz
- Q A 4500 lines/cm grating is illuminated by a single wavelength laser. What is the wavelength of this laser if the location of the second order maximum is at an angle...
- Q Assume a "vertical polarizer" transmits vertically polarized light. If a perfectly horizontally polarized light goes through a vertical polarizer, how much of the original light comes out?A. halfB. noneC. allD....
- Q What is the wavelength of light falling on double slits separated by 2.01 ?m, if the third-order minimum is at an angle of 58.0?
- Q 1 When the electron jumps from a level n 4 to n 1 the momentum of the recoiled hydrogen atom w be 4 n 1 affer recoiled 2 12 75...
- Q The decay rate of sample of radioactive nuclide 1128 after time 4 min and 36 min is 322 and 161 cour s Find half life for this radionuclide fui f...
- Q 3 Let L L L L denote the orbital angular momentum operators of a particle and let L L iL and L L iL The particle is in an eigenstate...
- Q The pure rotational levels of a molecule in the far infrared region follows the formula F J BJ J 1 where F J is the energy of the rotational level...
- Q N atoms of a radioactive element emits n alpha particles per second at an instant Then the half life of the element is sec 1 44
- Q Plz explain each step and also tell why 3rd option is not orrect 142 Which of these is Q value of decay of Na into 10 Ne m m and...
- Q Radioisotopes are used an variety to manufacturing and testing techniques Wear measurements can be made using the following method An automobile engine is produced using piston ring with a total...
- Q Q 1 The decay of a population by catastrophic two body collision is described by the following differential equation dN dt KN Solve the given differential using ordinary differential equation...
- Q If 80 of a first order reaction was completed in E minutes then 50 of the same reaction would be completed in log 5 0 7 log 3 0 48...
- Q Consider the following statements a The operation of the reactor is said to be critical if multiplication factor is equal to zero b The reaction rate is controlled by control...
- Q Decay rate for a certain mass of a radioactive substance measured at diffrent times varies with time as shown in fig countrate at t 8 hr will be Decays sec...
- Q Two radioactive materials X and X have decay constants 5A and respectively If initially they have the same number of nuclei then the ratio of the number of nuclei of...
- Q View In English If difference between points of time is 10 minutes radioactive substance when is 50 disintegrated and 75 disintegrated then average life of radioactive substance will be 1...
- Q The reason for why the sun shines and produces so much energy for billions of years was finally explained by Einstein s theory of A Photo electric Effect B Special...
- Q O A bacteria culture doubles every 10 minutes Using an exponential model of the form t P 2 where d is a doubling period find the time that it takes...
- Q Q 66 A radioactive battery consists of No atoms of radioactive element with disintegration constant and emitting a rays Fraction f of the emitted a rays is captured by other...
- Q 18 The rate of disintegration was observed to be 1017 disintegrations per sec when its half life period is 1445 years The original number of particles are 1 8 9...
- Q 5 In the following Column I lists some physical quantities and the Column II gives approximate energy values associated with some of them Choose the appropriate value of energy from...
- Q an elect a of the ord s a pho 15 In a mean life of a radioactive sample 1 About 1 3 of substance disintegrates 2 About 2 3 of...
- Q 3 A sample contains 16 g of a radioactive material the half life of which is two days After 32 days the amount of radioactive material left in the sample...
- Q The radioactive isotope Pt 188 decays into a stable nuclide after a series of 4 separate decays The daughter nucleus of each decay becomes the parent nucleus of the next...
- Q 59 secs The activity of a radioactive sample moving with velocity V is given by A detector at a distance from the sample detects number of counts per second If...
- Q Living matter has 1 3 x10 12 of its carbon in the form of 14C which has a half life of 5730 yr The mass of carbon in an animal...
- Q 10 A wood artifact is known to have decayed and only 55 of the original artifact remains The age of the wood artifac dating What is the age of the...
- Q At least 2 to up to 5 answers may be correct 1 Fusion and fission processes can often be viewed as the reverse process with respect to each other Examples...
- Q 5 The activity of a radioactive sample is measured as No counts per minute at t 0 and N e counts per minute at t 5 minutes The time at...
- Q Consider the stellar atmosphere consisting of hydrogen atoms which is in thermal equilibrium Let the average kinetic energy of hydrogen atoms be 1 0 eV Find a the temperature of...
- Q If mean life of a radioactive material is x more than half life then x A B C D 37 44 63 50
- Q the decay constant of two radioactive substances a and b are 4 per year and 5 per year respectively which one of the following is true for these two substances...
- Q M sec b The reaction L M is started with 10 g of L After 30 and 90 minute 5 g and 1 25 g of L are left respectively...
- Q The answer given is 3 but I guess answer should be 1 as will be formed when x is decayed and x will decay with ti e as no 1...
- Q SolveLancer Test Which of the following pairs represents the isobars in which preceding is the p decay product of the succeeding SolveLancer Test a 4N 4C b 22Ne Na 10...
- Q Example 14 A neutron fission counter is lined with U 235 to detect slow neutrons by ionizing fission fragments that produce an average energy of 200 MeV Find the pulse...
- Q If the rate constant for a first order reaction is k then time t the completion of 87 5 of the reaction is given by log102 0 301 O t...
- Q then the dot product of two 1 7 5 2 6 5 3 8 4 4 7 9 Two slits saperated by 4 mm are illuminated by light 2 of...
- Q will take to reduce the initial concentration value If rate constant for a first order reaction is 60 s 1 then how much time of the reactant to its th...
- Q Example 15 In a Stern Gerlach type experiment the magnetic field varies with distance in z direction according to dB dz 1 4 T mm Silver atoms travel a distance...
- Q 92 If the energy released in the fission of one 44 nucleus is 200 MeV then the number of nuclei required per second in a power plant of 16 kW...
- Q Example 14 An electron circles a nucleus of charge Ze Of the two orbits 1 and 2 of radii ri and r2 respectively its total energy is greater while in...
- Q A certain radio nuclide starts getting produced at a constant rate 104 s 1 by some mechanism at a certain moment t 0 At this moment there are already 105...
- Q 11 The type of equation shown below is an example of a an CaO H O Ca OH 2 O synthesis decomposition O single replacement O exchange of ions 3...
- Q Select one a a The number of kilograms y of a radioactive element that remains after t hours can be modeled by the equation y 0 23 0 91 What...
- Q suppose a sample of a radioactive substance weighs 40mg One year later the sample weighs 27 5 mg What is the half life of this substance round your answer to...
- Q Problem 11 Certain radioactive material decays in such a way that the mass remaining after t years is given by the function m t 320e 0 025t where m t...
- Q How does the theory of dramatic inflation when the universe was extremely young help astronomers understand why the cosmic microwave background radiation indicates very similar values for the temperature and...
- Q The activity of a radioactive substance reduces to 8 initial value in 60 years The mean life of the substance will be 28 9 years 27 years 20 years of...
- Q Q 134 A radio isotope X with a half life 1 4 x 10 years decays to Y which is stable A sample of the rock from a cave was...
- Q 13 Radioactive material A has decay constant 8 and material B has decay constant A Initially they have same number of nuclei After what time the ratio of number of...
- Q The radioactive nucleus can decay by two different processes The half life for the first process is t and that for the second process is t2 The effective half life...
- Q X The emission accompanied of electron in decay is by the emission of antineutrino The emission of electron in decay is accompanied by the emission of neutrino Free neutron unlike...
- Q A black body is at a temperature of 5760 K The energy of radiation emitted by the body at wavelength 250 nm is U at wavelength 500 nm is U...
- Q A radioactive sample decays by simultaneous emission of two particles with respective half lives E and 340 years The time in years after which 1 16 th of the material...
- Q A point like radioactive sample of decay constant X initially at a distance ro from a radiation counter starts moving towards the counter If the count number recorded by the...
- Q 6 Hydrogen H deuterium 4 singly ionized helium He and doubly ionized lithium Li all have one electron around the nucleus Consider n 2 to n 1 transition The wavelengths...
- Q Taking the mass of the muon to be 106 MeV c the mass of the pion to be 140 MeV c and the mass of the neutrino to be zero...
- Q The half life of a certain radioactive material 100 Z X is 6 93 x 106 seconds In order to have an initial activity of 6 x 108 Bq the...
- Q A soap bubble having radius of 1 mm is blown from a detergent solution having a surface tension of 2 5 x 10 2 N m The pressure inside the...
- Q Uranus and Neptune have enormously long periods for each orbit approximately 84 and 165 years respectively This causes the two worlds to rarely be in opposition that is as close...
- Q of the emitting atom assuming lonization potential of hydrogen is 13 6 eV 20 A neutron of kinetic energy 65 eV collides inelastically with a single ionized helium atom at...
- Q A nucleus mx emits two alpha particle and two beta particles The resulting nucleus is m 4 y n 2 m 8 y n 1 m 8 y n 2...
- Q Deuteron in its ground state has a total angular momentum J 1 and a positive parity The corresponding orbital angular momentum L and spin Scombinations are L 0 S 1...
- Q When a nucleus in an atom undergoes a radioactive decay the electronic energy levels of the atom O Change for a radioactivity but not for others O Change for B...
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