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Afnaan Sayed
Subject: Physics
, asked on 2/3/18
State the bohr postulate for the permitted orbitz for the electron in an hydrogen atom
Answer
2
Sakshi Sudhir Kudalkar
Subject: Physics
, asked on 1/3/18
An alpha-particle and a proton have the same de Broglie wavelength equal to 1 Å. Explain with calculations, which of the two has more kinetic energy.answer fast!
Answer
1
Yashashri Thakur
Subject: Physics
, asked on 1/3/18
78, though solution is provided in the question but it is not upto that mark, so please kindly let me know the solution without link...
Q.78. A 12.3 eV electron beam is used to bombard gaseous hydrogen at room temperature. Upto which energy level the hydrogen atoms would be excited?
Calculate the wavelengths of the second member of Lyman series and second member of Balmer series.
Answer
1
Varnika Dhiman
Subject: Physics
, asked on 1/3/18
Kindly tell me if we can use the formula E = -13.6/n^2 ?!..
If we can do so, then kindly solve. Also, tell that in this formula, we need to put the
value of E in eV or joules ?!..
Q.78. A 12.3 eV electron beam is used to bombard gaseous hydrogen at room temperature. Upto which energy level the hydrogen atoms would be excited?
Calculate the wavelengths of the second member of Lyman series and second member of Balmer series.
Answer
1
Poonam Tripathi
Subject: Physics
, asked on 27/2/18
From the relation 𝑹=R
0
𝑨
1/3
, where R
0
is constant & A is the mass number of the nucleus, show that nuclear matter density is independent of A.
Answer
1
Poonam Tripathi
Subject: Physics
, asked on 27/2/18
Q. A 12.5 eV electron beam is used to excite a gaseous hydrogen atom at room temperature. Determine the wavelengths and the corresponding series of the lines emitted.
Answer
2
Chaitanya Kapoor
Subject: Physics
, asked on 26/2/18
Solve
Q.10. Calculate the shortest wavelength in the Balmer series of hydrogen atom. In which region (infra- red, visible, ultraviolet) of hydrogen spectrum does this wavelength lie?
Answer
1
Vinuthna Terala
Subject: Physics
, asked on 25/2/18
Asap answer
Q.
The following graph shows the variation of stopping potential V
1
with the frequency of incidents radiation for two photosensitive metal plates P and Q,
a) Explain which metal has small threshold wave length.
b) Explain which metal emits photo electrons having smaller kinetic energy.
c)If the distance between the light sources and metal P is doubled how will the stopping potential change ?
Answer
1
Chaitanya Kapoor
Subject: Physics
, asked on 24/2/18
Solve 21st
Q.21. State Bohr's law of permitted orbits. What is the de Broglie wavelength of an electron in the first orbit of H-atom?
Answer
1
Nishma Dhand
Subject: Physics
, asked on 23/2/18
Q.28. The figure indicates the energy level diagram of an atom and the origin of six spectral lines in emission (e.g. line number 5 arises from the transition from level B to A). Which of the following spectral lines will also occur in the absorption spectrum?
(1) 4, 5, 6
(2) 1, 2, 3, 4, 5, 6
(3) 1, 2, 3
(4) 1, 4, 6
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 22/2/18
obtain an expression for period of electron in Nth orbit of hydrogen atom calculate the ratio of the period in second and third Orbit
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 22/2/18
a tube containing hydrogen gas with all atom in ground state .what is the minimum energy of the proton that can be absorbed by the atom .give reason for your answer .how much energy is required to make electron free from the atom.
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 22/2/18
Obtain an expression for total energy of electron in first orbit of doubly ionised lithium atom.how do these values compare with the corresponding value of hydrogen atom
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 22/2/18
obtain an expression for the kinetic energy of an electron revolving around the nucleus of hydrogen .show that the kinetic energy is numerically equal to the total energy and half the electrostatic potential energy of the electron.
Answer
1
Aashish Rohilla
Subject: Physics
, asked on 22/2/18
the first line of lyman series in hydrogen spectrum has a wavelength of 1220 angstrom .calculate the wavelength of second member of the series.
Answer
1
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Q.78. A 12.3 eV electron beam is used to bombard gaseous hydrogen at room temperature. Upto which energy level the hydrogen atoms would be excited?
Calculate the wavelengths of the second member of Lyman series and second member of Balmer series.
Q.78. A 12.3 eV electron beam is used to bombard gaseous hydrogen at room temperature. Upto which energy level the hydrogen atoms would be excited?
Calculate the wavelengths of the second member of Lyman series and second member of Balmer series.
Q.10. Calculate the shortest wavelength in the Balmer series of hydrogen atom. In which region (infra- red, visible, ultraviolet) of hydrogen spectrum does this wavelength lie?
Q. The following graph shows the variation of stopping potential V1 with the frequency of incidents radiation for two photosensitive metal plates P and Q, a) Explain which metal has small threshold wave length.
b) Explain which metal emits photo electrons having smaller kinetic energy.
c)If the distance between the light sources and metal P is doubled how will the stopping potential change ?
Q.21. State Bohr's law of permitted orbits. What is the de Broglie wavelength of an electron in the first orbit of H-atom?
(1) 4, 5, 6
(2) 1, 2, 3, 4, 5, 6
(3) 1, 2, 3
(4) 1, 4, 6