JEE Questions for Physics Atoms And Nuclei Quiz 15 - MCQExams.com

It the radius of a nucleus of mass number 3 is R. then the radius of a nucieus of mass mumber 81 is
  • 27 R
  • 9 R
  • 3 R
  • (27)1/7 R
An electron change its Position from orbit n = 4 to the orbit n = 2 of an atom the wave length of emitted radition in the form of R (where R is Redburg constant)

  • Physics-Atoms and Nuclei-63122.png
  • 2)
    Physics-Atoms and Nuclei-63123.png

  • Physics-Atoms and Nuclei-63124.png

  • Physics-Atoms and Nuclei-63125.png
which of the following isotopes normally fissonable

  • Physics-Atoms and Nuclei-63127.png
  • 2)
    Physics-Atoms and Nuclei-63128.png

  • Physics-Atoms and Nuclei-63129.png

  • Physics-Atoms and Nuclei-63130.png
which of the following statement is true

  • Physics-Atoms and Nuclei-63131.png
  • 2)
    Physics-Atoms and Nuclei-63132.png

  • Physics-Atoms and Nuclei-63133.png

  • Physics-Atoms and Nuclei-63134.png
A Free neutron decays into a Proton, an electron and
  • v
  • 2)
    Physics-Atoms and Nuclei-63136.png
  • β
  • α
The distance of the closest approach of an alpha particle fired at a nucleus with kinetic energy K is ro. The distemce of the closest approach when the α -particle is fired at the same nucleus with kinetic energy 2k will be.

  • Physics-Atoms and Nuclei-63138.png
  • 2)
    Physics-Atoms and Nuclei-63139.png

  • Physics-Atoms and Nuclei-63140.png

  • Physics-Atoms and Nuclei-63141.png
which of the following series in the spectrum of hydrogen ion lies in the visible region of the electron magnetic spectrum?
  • Paschen
  • Lyman
  • Brakett
  • Balmer
If 13.6 eV energy is required to ionige the hydrogen atom the energy required to remove the electron form n = 2 state is
  • Zero
  • 10.2 eV
  • 6.8 eV
  • 3.4 eV
It No is the original mass of the substance of halt lift 5 years, the amount of substance left after 15 years is

  • Physics-Atoms and Nuclei-63144.png
  • 2)
    Physics-Atoms and Nuclei-63145.png

  • Physics-Atoms and Nuclei-63146.png

  • Physics-Atoms and Nuclei-63147.png
At a certain instant, a radioactive sample has a decay rate of 5000 dis-interation Per minute. After 5 minuter the decay rate is 1250 dis-interations Per minute. Then the decay constant is (Per-min )
  • 0.2 ln 4
  • 0.4 ln 4
  • 0.4 ln 2
  • 0.8 ln 2
A nucleus with Z = 92 emits the following sequence α, α, β–, β–, α, α, α, α, β–, β–, α, β+, β+, α. The Z of the resulting nucleus is
  • 76
  • 78
  • 74
  • 82
which of the following can not be emitted in radioactive decay of the substance?
  • Helium-nucleus
  • Electrons
  • Neutrions
  • Proton

Physics-Atoms and Nuclei-63151.png
  • 8 fm
  • 6 fm
  • 4 fm
  • 5 fm
which of the following atom has the lowest ionisation potential?

  • Physics-Atoms and Nuclei-63153.png
  • 2)
    Physics-Atoms and Nuclei-63154.png

  • Physics-Atoms and Nuclei-63155.png

  • Physics-Atoms and Nuclei-63156.png
If the binding energy of electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron form the first state of Li2+ is.
  • 13.6 eV
  • 30.6 eV
  • 122.4 eV
  • 3.4 eV
The ionigation Potential of hydrogen atom is 13.6 eV. An electron in the ground state absords Photon of energy 12.75 eV. How many dirrerent spectral lines can one expect when electron make a down ward transition
  • 1
  • 2
  • 6
  • 4

Physics-Atoms and Nuclei-63160.png

  • Physics-Atoms and Nuclei-63161.png
  • 2)
    Physics-Atoms and Nuclei-63162.png

  • Physics-Atoms and Nuclei-63163.png

  • Physics-Atoms and Nuclei-63164.png

Physics-Atoms and Nuclei-63166.png

  • Physics-Atoms and Nuclei-63167.png
  • 2)
    Physics-Atoms and Nuclei-63168.png

  • Physics-Atoms and Nuclei-63169.png

  • Physics-Atoms and Nuclei-63170.png

Physics-Atoms and Nuclei-63172.png
  • neutron
  • gamma
  • alpha
  • Beta
Starting with a sample of Pure cu-66, 7/8 of it decays into Zn, 15 minutes the left of the sample is
  • 10 min
  • 5 min
  • 7.5 min
  • 15 min
An α -particle of energy 5 MeV is scattered though 180o by a fixed uranium nucleus. The distance of the closest approach nucleus The distance of the closest approach is of the order of
  • 10–8 cm
  • 10–12 cm
  • 10–10 cm
  • 10–15 cm

Physics-Atoms and Nuclei-63174.png
  • 23.6 MeV
  • 26.9 MeV
  • 13.9 MeV
  • 19.2 MeV
A radiation of energy E falls normally on a perfect reflecting surface. The momentum transferred to the surface is.

  • Physics-Atoms and Nuclei-63176.png
  • 2)
    Physics-Atoms and Nuclei-63177.png

  • Physics-Atoms and Nuclei-63178.png

  • Physics-Atoms and Nuclei-63179.png

Physics-Atoms and Nuclei-63181.png

  • Physics-Atoms and Nuclei-63182.png
  • 2)
    Physics-Atoms and Nuclei-63183.png

  • Physics-Atoms and Nuclei-63184.png

  • Physics-Atoms and Nuclei-63185.png

Physics-Atoms and Nuclei-63187.png
  • 1.46 MeV
  • 39.2 MeV
  • 17.28 MeV
  • 39.2 MeV
9 fmo is the mass of an isotope 817 0 , mp and mn are the masses of a Proton and neutron respectively, the binding energy of the isotebe is

  • Physics-Atoms and Nuclei-63189.png
  • 2)
    Physics-Atoms and Nuclei-63190.png

  • Physics-Atoms and Nuclei-63191.png

  • Physics-Atoms and Nuclei-63192.png
In gamma ray emission form a nucleus
  • there is no change in the proton-number and neutron number
  • Both the number are changes
  • only Proton number change
  • only neutron number change
The half life time of a radioactive elements of x is the same as the mean life of another radioactive element Y. Initially they have same number of atoms, then
  • y will decay faster thean x
  • x will decay faster then y
  • x and y will decay at the same rate at all time
  • x and y will decay at the same rate initially.
which of the following transition in hydrogen atoms emits Photon of highest frequency?
  • n = 2 to n = 6
  • n = 1 to n = 2
  • n = 2 to n = 1
  • n = 6 to n = 2
An electron Passing through a Potential difference of 4.9 v collides with a mercury atom and transfer it to the first excited state what is transfer it to the first excited state. what is the wave length of Photon corresponding to the fraction of mercury atom to its normal state.
  • 2050Å
  • 2935Å
  • 2525Å
  • 2240Å
The binding energy per nucleon for the Parent nucleus is E1 and that for the daughter nuclei is E2 then
  • E1 < E2
  • E1 > E2
  • E1 = E2
  • E1 = 2E2
The speed of daughter nuclei is

  • Physics-Atoms and Nuclei-63197.png
  • 2)
    Physics-Atoms and Nuclei-63198.png

  • Physics-Atoms and Nuclei-63199.png

  • Physics-Atoms and Nuclei-63200.png
Light form the discharge tube containing hydrogen atom falls on the surface of a piece of sodium. The kinetic energy of the fastest photo electrons emitted form sodium is 0.73 eV. The work function for sodium is 1.82 eV. Ionisation Potential of hydrogen is 13.6 v and the mass of hydrogen atom is 1.67 × 10–27 Kg
The energy of Photon causing the Photo electric emission is
  • 4.08 × 10–19 J
  • 2.912 × 10–19 J
  • 1.744 × 10–19 J
  • 1.168 × 10–19 J
Light form the discharge tube containing hydrogen atom falls on the surface of a piece of sodium. The kinetic energy of the fastest photo electrons emitted form sodium is 0.73 eV. The work function for sodium is 1.82 eV. Ionisation Potential of hydrogen is 13.6 v and the mass of hydrogen atom is 1.67 × 10–27 Kg
The quantum number of the two levels in the emission of the Photons are
  • n = 1 , n = 3
  • n = 2 , n = 4
  • n = 1 , n = 4
  • n = 3 , n = 4
Light form the discharge tube containing hydrogen atom falls on the surface of a piece of sodium. The kinetic energy of the fastest photo electrons emitted form sodium is 0.73 eV. The work function for sodium is 1.82 eV. Ionisation Potential of hydrogen is 13.6 v and the mass of hydrogen atom is 1.67 × 10–27 Kg
In this transition change in the angular momentum of electron is (where h is Plank constant )

  • Physics-Atoms and Nuclei-63204.png
  • 2)
    Physics-Atoms and Nuclei-63205.png

  • Physics-Atoms and Nuclei-63206.png

  • Physics-Atoms and Nuclei-63207.png
Light form the discharge tube containing hydrogen atom falls on the surface of a piece of sodium. The kinetic energy of the fastest photo electrons emitted form sodium is 0.73 eV. The work function for sodium is 1.82 eV. Ionisation Potential of hydrogen is 13.6 v and the mass of hydrogen atom is 1.67 × 10–27 Kg
The recoil speed of emitting atom causing that is at lest before the transition is of the order of
  • 1 cms–1<.sup>
  • 102 ms–1
  • 104 ms–1
  • 12 ms–1
A and B are two radioactive substane whose half lives are 1 and 2 years respectively. Initially 10 g of A and 1 g of B is taken. The time after which they will have same quantity remaining is
  • 3.6 years
  • 7 years
  • 6.6 years
  • 5 years
The activity of a sample of a radio- active material is at time t1 and A2 at time t2 (where t2 > t1) if T its mean life is then
  • A1t1 = A2 t2
  • 2)
    Physics-Atoms and Nuclei-63211.png

  • Physics-Atoms and Nuclei-63212.png

  • Physics-Atoms and Nuclei-63213.png

Physics-Atoms and Nuclei-63215.png
  • 90 , 234
  • 92 , 236
  • 88 , 234
  • 91 , 234
gf 92U238 undergoes sucesively 8 α decays and 6 β decays then resulting nucleus is
  • Pb206
  • Pb208
  • Pb214
  • None of these
The energy released by the fission of one uranium atom is 200 MeV. The number of fission Per second required to Produce 3.2 w of Power is
  • 1010
  • 107
  • 1012
  • 1011
Radio carbon dating is done by estimating in the specimen
  • the amount of oridinary carbon still present
  • 2)
    Physics-Atoms and Nuclei-63219.png
  • the amount of radio carbon still Present
  • None of these
The total energy of the electron in the first excited state of hydrogen is –3.4 eV. what is the kinetic energy of the electron in this state?
  • 6.8 eV
  • 3.4 eV
  • –3.4 eV
  • –6.8 eV
The wave length of second line of Balmer series is 486.4 nm. what is the wave length of the first line of lyman series ?
  • 364.8 nm
  • 729.6 nm
  • 121.6 nm
  • None of these
The innermost orbit of the hydrogen atom has a radius 0.53 A. what is radius of 2nd orbit is ?
  • 2.12Å
  • 1.06Å
  • 21.2Å
  • 10.6Å
If a hydrogen atom emits a photon of wave length, the recoil speed of the atom of mass m is given by

  • Physics-Atoms and Nuclei-63223.png
  • 2)
    Physics-Atoms and Nuclei-63224.png

  • Physics-Atoms and Nuclei-63225.png

  • Physics-Atoms and Nuclei-63226.png
A freshly prepared radio active source of half time 2 h emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which is would be possible to work safely with this source is.
  • 6 h
  • 24 h
  • 12 h
  • 36 h
In Rutherford experiment, the numer of Particles sccttered at 90o angle are 28 per min. Then the number of particles at the angle 1200 in per min will be
  • 25
  • 12.0
  • 50
  • 112
The Rutherford revolution per second made by an electron in the first Bohr orbit of hydrogen atom is of the order of
  • 1015
  • 1020
  • 1010
  • 1019
The half time of a radioactive substance is 20 min, difference between points of time when it is 33% disintegrated and 67% disseminated is approximately
  • 10 min
  • 20 min
  • 40 min
  • 30 min
0:0:1


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