JEE Mains Physics 2002-2019 Solved Video Solutions
In a radioactive decay chain, the initial nucleus is 23290Th . At the end there are 6 α-particles and 4 β-particles which are emitted. If the end nucleus, If AZX , A and Z are given by :
28
Nov
In a radioactive decay chain, the initial nucleus is 23290Th . At the end there are 6 α-particles and 4 β-particles which are emitted. If the end nucleus, If AZX , A and Z are given by : A and Z are given by : If AZX In a radioactive decay chain the initial nucleus [...]
In a hydrogen like atom, when an electron jumps from the M – shell to the L – shell, the wavelength of emitted radiation is λ. If an electron jumps from N-shell to the L-shell, the wavelength of emitted radiation will be :
28
Nov
In a hydrogen like atom, when an electron jumps from the M – shell to the L – shell, the wavelength of emitted radiation is λ. If an electron jumps from N-shell to the L-shell, the wavelength of emitted radiation will be : In a hydrogen-like atom the wavelength of emitted radiation is λ. If [...]
A hydrogen atom, initially in the ground state is excited by absorbing a photon of wavelength 980A˚. The radius of the atom in the excited state, it terms of Bohr radius a0, will be : (hc = 12500 eV – A˚)
28
Nov
A hydrogen atom, initially in the ground state is excited by absorbing a photon of wavelength 980A˚. The radius of the atom in the excited state, it terms of Bohr radius a0, will be : (hc = 12500 eV – A˚) A hydrogen atom initially in the ground state is excited by absorbing a photon [...]
Consider the nuclear fission Ne20⟶2He^4+C^12 Given that the binding energy/nucleon of Ne^20,He^4 and C^12 are, respectively, 8.03 MeV, 7.07 MeV and 7.86 MeV, identify the correct statement :
28
Nov
Consider the nuclear fission Ne20⟶2He^4+C^12 Given that the binding energy/nucleon of Ne^20,He^4 and C^12 are, respectively, 8.03 MeV, 7.07 MeV and 7.86 MeV, identify the correct statement : 7.07 MeV and 7.86 MeV 8.03 MeV Consider the nuclear fission Ne20⟶2He^4+C^12 Given that the binding energy/nucleon of Ne^20 He^4 and C^12 are identify the correct statement [...]
Using a nuclear counter the count rate of emitted particles from a radioactive source is measured. At t = 0 it was 1600 counts per second and t = 8 seconds it was 100 counts per second. The count rate observed, as counts per second, at t = 6 seconds is close to :
28
Nov
Using a nuclear counter the count rate of emitted particles from a radioactive source is measured. At t = 0 it was 1600 counts per second and t = 8 seconds it was 100 counts per second. The count rate observed, as counts per second, at t = 6 seconds is close to : Radiation [...]
The magnetic field associated with a light wave is given, at the origin, by B=B0[sin(3.14×10^7)ct + sin(6.28×10^7)ct]. If this light falls on a silver plate having a work function of 4.7 eV, what will be the maximum kinetic energy of the photo electrons ? (c = 3 × 10^8ms−1,h = 6.6 × 10^−34J−s)
28
Nov
The magnetic field associated with a light wave is given, at the origin, by B=B0[sin(3.14×10^7)ct + sin(6.28×10^7)ct]. If this light falls on a silver plate having a work function of 4.7 eV, what will be the maximum kinetic energy of the photo electrons ? (c = 3 × 10^8ms−1,h = 6.6 × 10^−34J−s) at the [...]
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at the origin ,
by B=B0[sin(3.14×10^7)ct + sin(6.28×10^7)ct]. If this light falls on a silver plate having a work function of 4.7 eV ,
h = 6.6 × 10^−34J−s) ,
The magnetic field associated with a light wave is given ,
what will be the maximum kinetic energy of the photo electrons ? (c = 3 × 10^8ms−1 ,
At a given instant, say t = 0, two radioactive substances A and B have equal . The ratio of their activities RB/RA decreases according to e^−3t . If the half-life of A is In2, the half-life of B is :
28
Nov
At a given instant, say t = 0, two radioactive substances A and B have equal . The ratio of their activities RB/RA decreases according to e^−3t . If the half-life of A is In2, the half-life of B is : At a given instant say t = 0 the half-life of B is : [...]
A sample of radioactive material A, that has an activity of 10mCi(lCi=3.7×10^10 decays/s), has twice the number of nuclei as another sample of a different radioactive maternal B which has an activity of 20 mCi. The correct choices for hall-lives of A and B would then be respectively :
28
Nov
A sample of radioactive material A, that has an activity of 10mCi(lCi=3.7×10^10 decays/s), has twice the number of nuclei as another sample of a different radioactive maternal B which has an activity of 20 mCi. The correct choices for hall-lives of A and B would then be respectively : A sample of radioactive material A [...]
Surface of certain metal is first illuminated with light of wavelength λ1=350nm and then, by light of wavelength λ2=540 nm. It is found that the maximum speed of the photo electrons in the two cases differ by a factor of 2. The work function of the metal (in eV) is close to : (Energy of photon = 1240/λ(innm)eV)
28
Nov
Surface of certain metal is first illuminated with light of wavelength λ1=350nm and then, by light of wavelength λ2=540 nm. It is found that the maximum speed of the photo electrons in the two cases differ by a factor of 2. The work function of the metal (in eV) is close to : (Energy of [...]
Half lives of two radioactive nuclei A and B are 10 minutes and 20 minutes, respectively. If, initially a sample has equal number of nuclei, then after 60 minutes, the ratio of decayed numbers of nuclei A and B will be :
28
Nov
Half lives of two radioactive nuclei A and B are 10 minutes and 20 minutes, respectively. If, initially a sample has equal number of nuclei, then after 60 minutes, the ratio of decayed numbers of nuclei A and B will be : Half lives of two radioactive nuclei A and B are 10 minutes and [...]