Description : Calculate the radius of the first and second orbit of sodium atom `(Z=11)`. `(h=6.6xx10^(-34) J s, e=1.6xx10^(-19) C` and `m=9.1xx10^(-31) kg.)`
Last Answer : Calculate the radius of the first and second orbit of sodium atom `(Z=11)`. `(h=6.6xx10^(-34) J s, e=1.6xx10^(-19) C` and `m=9.1xx10^(-31) kg.)`
Description : In hydrogen atom, the electron is making `6.6xx10^(15) rev//sec` around the nucleus in an orbit of radius `0.528 A`. The magnetic moment `(A-m^(2)) wi
Last Answer : In hydrogen atom, the electron is making `6.6xx10^(15) rev//sec` around the nucleus in an orbit of radius `0. ... ` C. `1xx10^(-23)` D. `1xx10^(-27)`
Description : A proton of mass `1.67xx10^(-27)` kg charge `1.6xx10^(-19) C` is projected in xy-plane with a speed of `2xx10^(6) m//s` at an angle of `60^(@)` to the
Last Answer : A proton of mass `1.67xx10^(-27)` kg charge `1.6xx10^(-19) C` is projected in xy-plane with a speed ... radius 0.14 m and time period `1.0xx10^(-7)s`
Description : Calculate the speed of the electron in the first Bohr orbit given that `h=6.6xx10^(-34) Js, m=9.11xx10^(-31) kg` and `e=1.603xx10^(-19) C`.
Last Answer : Calculate the speed of the electron in the first Bohr orbit given that `h=6.6xx10^(-34) Js, m=9.11xx10^(-31) kg` and `e=1.603xx10^(-19) C`.
Description : Electrons move at right angles to a magnetic field of `1.5xx10^(-2)` Tesla with a speed of `6xx10^(7)m//s`. If the specific charge of the electron is
Last Answer : Electrons move at right angles to a magnetic field of `1.5xx10^(-2)` Tesla with a speed of `6xx10^ ... C//kg`. The radius of the circular path will be
Description : In hydrogen atom, an electron is revolving in the orbit of radius `0.53 Å` with `6.6xx10^(15) rotations//second`. Magnetic field produced at the centr
Last Answer : In hydrogen atom, an electron is revolving in the orbit of radius `0.53 Å` with `6.6xx10^(15) rotations//second`. ... 5 Wb//m^(2)` D. `125 Wb/m^(2)`
Description : An electron moves in a circular orbit of radius 10 cm with a constant speed of `4.0xx10^(6) ms^(-1)`. Determine the electric current at a point on the
Last Answer : An electron moves in a circular orbit of radius 10 cm with a constant speed of `4.0xx10^(6 ... Determine the electric current at a point on the orbit.
Description : Calculate the energy of hydrogen atom in the ground state given that the after Bohr orbit og hydrogen is `5xx10^(-11)m` and electronic charge is `1.6x
Last Answer : Calculate the energy of hydrogen atom in the ground state given that the after Bohr orbit og hydrogen is ` ... electronic charge is `1.6xx10^(-19) C`.
Description : A particle of charge `q` and mass `m` moves in a circular orbit of radius `r` with angular speed `omega`. The ratio of the magnitude of its magnetic m
Last Answer : A particle of charge `q` and mass `m` moves in a circular orbit of radius `r` with angular speed `omega`. The ... C. `q` and `m` D. `omega` and `m`
Description : A proton moves at a speed `v = 2xx10^(6) m//s` in a region of constant magnetic field of magnitude B = 0.05 T. The direction of the proton when it ent
Last Answer : A proton moves at a speed `v = 2xx10^(6) m//s` in a region of constant magnetic field of magnitude B = 0.05 T. ... `0.209 m` C. `2.82 m` D. `2.41 m`
Description : An electron moves in a circular orbit with a uniform speed `v`.It produces a magnetic field `B` at the centre of the circle. The radius of the circle
Last Answer : An electron moves in a circular orbit with a uniform speed `v`.It produces a magnetic field `B` at the centre of the ... (v)/(B))` D. `sqrt((B)/(v))`
Description : In a hydrogen atom, the electron makes about `0.6xx10^(16)` revolutions per second around the nucleus. Determine the average current at any point on t
Last Answer : In a hydrogen atom, the electron makes about `0.6xx10^(16)` revolutions per second around the nucleus. ... at any point on the orbit of the electron.
Description : An α particle moves perpendicular to a constant magnetic field of strength 1.2 T in a circular path of radius 0.7 m. The speed of α particle in ms-1 is ______________ a) 2.7 × 107 b) 2.6 × 107 c) 3.2 × 107 d) 2.0 × 107
Last Answer : a) 2.7 × 107
Description : Calculate the mass and mean density of the earth from the following data : `{:(,"Gravitational constant",(G),=6.6xx10^(-11)Nm^(2)kg^(-2)),(,"Radius of
Last Answer : Calculate the mass and mean density of the earth from the following data : `{:(,"Gravitational constant",(G),=6. ... to gravity",(g),=9.8ms^(-2)):}`
Description : An electron revolves in a circule at the rate of `10^(19)` rounds per second. The rquivlent current is `(e=1.6xx10^(-19)C)`
Last Answer : An electron revolves in a circule at the rate of `10^(19)` rounds per second. The rquivlent current is `(e=1.6xx10^( ... B. `1.6A` C. `2.0A` D. `2.6A`
Description : The angular momentum J of the electron in a hydrogen atom is proportional to `n^(th)` power of r (radius of the orbit) where n is :-
Last Answer : The angular momentum J of the electron in a hydrogen atom is proportional to `n^(th)` power of r (radius of the orbit ... B. `-1` C. `(1)/(2)` D. None
Description : The quantized Bohr orbit radius of electron in hydrogen atom is given by a) n2 r3 b) nr1 c) n2 r2 d) n2 r1
Last Answer : d) n2 r1
Description : The satellite moves in a circle around the earth. The radius of this circle is equal to one-half the radius of the moons orbit. The satellite will complete one revolution in a.1 lunar month b.2-3/4 lunar month c.2-2/3 lunar month d.None of the above e.
Last Answer : e. None of the above
Description : A rheostat has 100 turns of a wire of radius 0.4 mm having resistivity `4.2xx10^(-7) Omega`m. The diameter of each turn is 3 cm. What is the maximum v
Last Answer : A rheostat has 100 turns of a wire of radius 0.4 mm having resistivity `4.2xx10^(-7) ... the maximum value of resistance that it can introduce ?
Description : A charged particle with a velocity `2xx10^(3) ms^(-1)` passes undeflected through electric field and magnetic fields in mutually perpendicular directi
Last Answer : A charged particle with a velocity `2xx10^(3) ms^(-1)` passes undeflected through electric field and magnetic fields ... 1)` D. `1.33xx10^(3)NC^(-1)`
Description : The angular diameter of the sun is 1920". If the distance of the sun from the earth is `1.5xx10^(11)`m, what is the linear diameter of the sun ?
Last Answer : The angular diameter of the sun is 1920". If the distance of the sun from the earth is `1.5xx10^(11)`m, what is the linear diameter of the sun ?
Description : An alectron in a circular orbit of radius 0.05 mn performs `10^(16) "rev"//s.` the magnetic moment due to this ratation of electron is `(in A-m^(2)).`
Last Answer : An alectron in a circular orbit of radius 0.05 mn performs `10^(16) "rev"//s.` the magnetic moment due to ... `3.21xx10^(-24)` D. `1.26xx10^(-23)`
Description : Calculate the frequency of revolution of an electron in the first orbit of an aluminum atom. Given that mass of electron `=9x10^(-31) kg, e= 1.6 xx10^
Last Answer : Calculate the frequency of revolution of an electron in the first orbit of an aluminum atom. Given that mass of ... of the orbit `=0.2xx10^(-11) m`.
Description : A 10 C of charge flows through a wire in 5 minutes. The radius of the wire is 1 mm. It contains `5xx10^(22)` electrons per `"centimetre"^(3)`. Calcula
Last Answer : A 10 C of charge flows through a wire in 5 minutes. The radius of the wire is 1 mm. It ... centimetre"^(3)`. Calculate the current and drift velocity.
Description : `._(92)^(238)U` atom distintgrates to `._(84)^(214) Po` with a half life of `4.5xx10^(9)` years by emitting six alpha particles and n electrons. Here
Last Answer : `._(92)^(238)U` atom distintgrates to `._(84)^(214) Po` with a half life of `4.5xx10^(9)` years by emitting ... . Here n is - A. 6 B. 4 C. 10 D. 7
Description : An electron moves with a velocity of 2 × 106 ms-1 in the direction of a uniform magnetic field of 0.8 Tesla. The force on electron is a) 8 N b) 2 N c) 4 N d) Zero
Last Answer : d) Zero
Description : What is the drift velocity of electrons in a copper conductor having a cross-sectional area of `5xx10^(-6) m^(2)` if the current is 10 A. Assume there
Last Answer : What is the drift velocity of electrons in a copper conductor having a cross-sectional area of `5xx10^(-6) m^( ... `8.0xx10^(28) "electrons"//m^(3)`.
Description : A satellite orbits the earth 200 km above the surface. What speed, in m/s, is necessary for a circular orbit? The radius of the earth is 6400 km and g = 9.2 m/s2 a.7200 b.6600 c.7800 d.6000 e.107 dynes
Last Answer : c. 7800
Description : The de-Broglie wavelength of an electron moving in the nth Bohr orbit of radius ris given by
Last Answer : The de-Broglie wavelength of an electron moving in the nth Bohr orbit of radius ris given by A. `(2pir)/n` B. `npir` C. `(nr)/(2pi)` D. `(nr)/pi`
Description : The radius of the shortest orbit in a one-electron system is 18 pm. It may be
Last Answer : The radius of the shortest orbit in a one-electron system is 18 pm. It may be A. Hydrogen B. Deuterium C. `He^+` D. `Li^+`
Description : Calculate the radius of the first Bohr orbit of a `He^(+)` ion and the binding energy of its electron in the ground state.
Last Answer : Calculate the radius of the first Bohr orbit of a `He^(+)` ion and the binding energy of its electron in the ground state.
Description : An electron moving in a circular orbit of radius `r` makes `n` rotation per secound. The magnetic field produced at the centre has magnitude
Last Answer : An electron moving in a circular orbit of radius `r` makes `n` rotation per secound. The magnetic field produced at ... (r)` D. `(mu_(0)"ne")/(2r)`
Description : The average current due to an electron orbiting the proton in the `n^(th)` Bohr orbit of the hydrogen atom is
Last Answer : The average current due to an electron orbiting the proton in the `n^(th)` Bohr orbit of the hydrogen atom ... `propn^3` C. `propb` D. none of these
Description : According to Bohr's theory of hydrogen atom, the angular momentum of the electron in the fourth orbit is given by (a) h/2p (b) 4h/p (c) h/p (d) 2h/p
Last Answer : Ans:(d)
Description : The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is?
Last Answer : 5x/36
Description : For the hydrogen atom, which series describes electron transitions to the N = 2 orbit? Is it the: w) Lyman series x) Paschen series y) Balmer series z) Pfund series
Last Answer : ANSWER: Y -- BALMER SERIES
Description : For the hydrogen atom, which series describes electron transitions to the N=1 orbit, the lowest energy electron orbit? Is it the: w) Lyman series x) Balmer series y) Paschen series z) Pfund series
Last Answer : ANSWER: W -- LYMAN SERIES
Description : The value of first quantized Bohr orbit radius of hydrogen atom is a) 0.0053 nm b) 5.3 nm c) 0.053 nm d) 0.053 cm
Last Answer : c) 0.053 nm
Description : An electron is travelling at right angles to a uniform magnetic field of flux density 1.2 mT with a speed of 8 × 106 m s-1, the radius of circular path followed by electron is A. 3.8 cm B. 3.7 cm C. 3.6 cm D. 3.5 cm
Last Answer : 3.8 cm
Description : A cyclist moves uniformaly on a horizontal circular track of radius 100 m . If the cofficient of friction is 0.1. At which of the following speed (s)
Last Answer : A cyclist moves uniformaly on a horizontal circular track of radius 100 m . If the cofficient of friction is 0.1. ... m/s C. 14 m/s D. none of these
Description : A particle moves in a circle with constant speed of 15 m/s. The radius of the circle is 2 m.
Last Answer : A particle moves in a circle with constant speed of 15 m/s. The radius of the circle is 2 m. Determine the centripetal acceleration of the particle.
Description : A particle of mass m moves in a circular path of radius r at constant speed v. Its KE is (a) mv2/r (b) ½ Iw (c) ½ mv2 (d) ½ mrw2
Last Answer : Ans:(c)
Description : What centripetal force is needed to keep a kg object moving at a constant speed of ms in a circle having a radius of 4 m?
Last Answer : What is the answer ?
Description : What happens when an electron moves nearer to the nucleus of the atom?
Last Answer : Its energy decreases
Description : The radius of hydrogen atom is about a) 5 x 10-11 m b) 5 x 10-11 cm c) 5 x 10-11 mm d) 5 x 10-11 dm
Last Answer : a) 5 x 10-11 m
Description : On treatment of 100mL of 0.1 M solution of `CoCl_(3).6H_(2)O` with excess `AgNO_(3),1.2xx10^(22)` ions are precipitated. The complex is :
Last Answer : On treatment of 100mL of 0.1 M solution of `CoCl_(3).6H_(2)O` with excess `AgNO_(3),1.2xx10^(22)` ions are ... `[Co(H_(2)O)_(4)Cl_(2)]Cl.2H_(2)O`
Description : A particle of mass `m` moves along a circular orbit in centrosymmetrical potential field `U(r )=kr^(2)//2`. Using the Bohr quantization condition, fin
Last Answer : A particle of mass `m` moves along a circular orbit in centrosymmetrical potential field `U(r ... orbital radii and energy levels to that particle.
Description : The coil of a moving coil galvanometer has an effective area of 4xx10^(-2)m^(2)`. It is suspended in a magnetic field of `5xx10^(-2)` Wb `m^(-2)`. If
Last Answer : The coil of a moving coil galvanometer has an effective area of 4xx10^(-2)m^(2)`. It is suspended in a ... D. current sensitivity is `40 deg` `A^(-1)`
Description : An electron starting at angle `alpha=60^(@)` with a uniform magnetic induction `B=0.1 T` moves with velocity `v=10^(6) m s^(-1)`. A screen is held at
Last Answer : An electron starting at angle `alpha=60^(@)` with a uniform magnetic induction `B=0.1 T` ... to the point on the screen where the electron strikes.