The energy of a hydrogen atom in the ground state is – 13.6 eV. The energy of a He⁺ ion
The energy of a hydrogen atom in the ground state is -13.6 eV. The energy of a He⁺ ion in the first excited state will be
Options
(a) – 13.6 eV (b) – […]
Questions
The ratio of volumes of nuclei (assumed to be in spherical shape) with respective
The ratio of volumes of nuclei (assumed to be in spherical shape) with respective mass number 8 and 64 is
Options
(a) 0.5 (b) 2 (c) 0.125 (d) 0.25
Correct Answer:
0.125
Explanation: […]
Which series of hydrogen spectrum corresponds to ultraviolet region?
Which series of hydrogen spectrum corresponds to ultraviolet region?
Options
(a) Balmer series (b) Brackett series (c) Paschen series (d) Lyman series
Correct Answer:
Lyman series
Explanation:
No explanation available. Be the first […]
In a Rutherford scattering experiment when a projectile of charge Z₁ and mass M₁
In a Rutherford scattering experiment when a projectile of charge Z₁ and mass M₁ approaches a target nucleus of charge Z₂ and mass M₂, the distance of closest approach is r. The energy of the […]
The cadmium rods are used in nuclear reactor to
The cadmium rods are used in nuclear reactor to
Options
(a) Speed up neutrons (b) Slow down neutrons (c) Emit neutrons (d) Absorb some neutrons
Correct Answer:
Absorb some neutrons
Explanation:
No explanation […]
Spectrum of X-rays is
Spectrum of X-rays is
Options
(a) continous (b) linear (c) continous and linear (d) band
Correct Answer:
continous
Explanation:
No explanation available. Be the first to write the explanation for this question by […]
The kinetic energy of an electron in the first excited state is
The total energy of electron in the ground state of hydrogen atom is -13.6 eV. The kinetic energy of an electron in the first excited state is
Options
(a) 6.8 eV (b) 13.6 […]
The radius of the first orbit of the hydrogen atom is a₀. The radius of the second orbit
The radius of the first orbit of the hydrogen atom is a₀. The radius of the second orbit will be
Options
(a) 4 a₀ (b) 6 a₀ (c) 8 a₀ (d) 10 a₀
The ionisation energy of an electron in the ground state of helium atom is 24.6 eV.
The ionisation energy of an electron in the ground state of helium atom is 24.6 eV. The energy required to remove both the electron is
Options
(a) 51.8 eV (b) 79 eV (c) […]
Light emitted during the de excitation of electron from n=3 to n=2, when incident
Light emitted during the de excitation of electron from n=3 to n=2, when incident on a metal, photoelectrons are just emitted from that metal. In which of the following de excitations photoelectric effect is not […]