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 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
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
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 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 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 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 on a metal, photoelectrons are just emitted from that metal. In which of the following de excitations photoelectric effect is not […]
The ratio of speed of an electron in ground state in Bohr’s first orbit of hydrogen atom to velocity of light in air (c ) is
Options
(a) e²/2ε₀hc (b) 2e²ε₀/hc (c) e³/2ε₀hc (d) […]
The Kα X-ray of molybdenum has a wavelength of 71×10⁻¹² m. If the energy of a molybdenum atom with K- electron removed is 23.32 keV, then the energy of molybdenum atom when an L-electron removed […]
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