HARD
Earn 100

To produce characteristic X-rays using a Tungsten target in an X-ray generator, the accelerating voltage Vaccelerating should be greater than ______ volts and the energy E of the characteristic radiation is ______ eV.

(The binding energy of the innermost electron in Tungsten is 40 keV).

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Important Questions on Atomic Physics

EASY
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
An electron from various excited states of hydrogen atom emit radiation to come to the ground state. Let λn, λg be the de Broglie wavelength of the electron in the nth state and the ground state respectively. Let ∧n be the wavelength of the emitted photon in the transition from the nth state to the ground state. For large n, (A, B are constants)
EASY
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
Electrons of mass, m with de-Broglie wavelength, λ fall on the target in an X-ray tube. The cutoff wavelength, λ0 of the emitted X-ray is
EASY
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
The ratio of wavelengths of the last line of the Balmer series and the last line of the Lyman series is_____.
MEDIUM
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
The energy required to ionise a hydrogen like ion in its ground state is 9 Rydbergs. What is the wavelength of the radiation emitted when the electron in this ion jumps from the second excited state to the ground state?
MEDIUM
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
An electron beam is accelerated by a potential difference V to hit a metallic target to produce X-rays. It produces continuous as well as characteristic X-rays. If λmin is the smallest possible wavelength of X-ray in the spectrum, the variation of logλmin with logV is correctly represented in :
MEDIUM
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
A He+ ion is in its first excited state. Its ionization energy is:
HARD
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
The radius of the orbit of an electron in a Hydrogen-like atom is 4.5 a0, where a0 is the Bohr radius. Its orbital angular momentum is 3 h 2 π . It is given that h is Planck's constant and R is Rydberg constant. The possible wavelengths, when the atom de-excites, is (are)
HARD
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
In hydrogen spectrum, Lα line arises due to transition of electron from the orbit n=3 to the orbit n=2. In the spectrum of singly ionized helium, there is a line having the same wavelength as that of the Lα line of hydrogen. This is due to the transition of the electron from the orbit ______ to ________
MEDIUM
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
How are the characteristic x-rays spectrum formed?
EASY
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
The waves emitted when a metal target is bombarded with high energy electrons are
EASY
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
12 eV energy is given to electron in third orbit of H-atom, then final energy of electron when it ionise from third orbit, is
EASY
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
Wavelength of characteristic X-ray depends on which property of target? where, A=Mass number, Z=Atomic number
EASY
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
W. K. Roentgen discovered
MEDIUM
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
If the series limit frequency of the Lyman series is VL, then the series limit frequency of the Pfund series is:
EASY
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
The series corresponding to lowest wavelength transition in H - atom.
MEDIUM
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
Hydrogen atom in its ground state is excited by a monochromatic light of energy 13.06eV. The longest wavelength among the spectral lines is (Ionization energy of hydrogen atom is 13.6eV)
EASY
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
A hydrogen atom is in a state with energy -1.51eV. In the Bohr model, the angular momentum of the electron in the atom with respect to an axis at the nucleus, is h2π=1.05×10-34 J s
EASY
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is:
MEDIUM
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
In an X-ray tube, electrons emitted from a filament (cathode) carrying current I hit a target (anode) at a distance d from the cathode. The target is kept at a potential V higher than the cathode resulting in emission of continuous and characteristic X-rays. If the filament current I is decreased to I2, the potential difference V is increased to 2V, and the separation distance d is reduced to d2, then
EASY
Physics>Modern Physics>Atomic Physics>Characteristic and Continuous X-Rays
An X-ray tube is operated at 1.24 million volt. The shortest wavelength of the produced photon will be: