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If the voltage across the filament is increased, the cutoff wavelength

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Important Questions on Atomic Physics

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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 1>Q 44
The characteristic X-ray spectrum is emitted due to transition of
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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 1>Q 45
When ultraviolet light is incident on a photocell, its stopping potential is V0 and the maximum kinetic energy of the photoelectrons is Kmax. When X-rays are incident on the same cell, then :
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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 2>Q 1
An α-particle of energy 5 MeV is scattered through 180° by a fixed uranium nucleus. The distance of closest approach is of the order of :
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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 2>Q 2
An energy of 24.6eV is required to remove one of the electrons from a neutral helium atom. The energy (In eV) required to remove both the electrons from a neutral helium atom is :
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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 2>Q 3
An atom consists of three energy levels given by a ground state with energy E0=0, the first excited state with energy E1=K and the second excited state with energy E2=2K where K>0. The atom is initially in the ground state. Light from a laser which emits photons with energy 1.5K is shined on the atom. Which of the following is/are correct ?
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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 2>Q 4
In a hydrogen like atom electron makes transition from an energy level with quantum number n to another with quantum number (n–1). If n≫1, the frequency of radiation emitted is proportional to :
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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 2>Q 5
The relation between λ1:wavelength of series limit of Lyman series, λ2:the wavelength of the series limit of Balmer series & λ3:the wavelength of first line of Lyman series is
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Alpha Question Bank for Engineering: Physics>Chapter 33 - Atomic Physics>Exercise - 2>Q 6
Ultraviolet light of wavelengths λ1 and λ2 when allowed to fall on hydrogen atoms in their ground state is found to liberate electrons with kinetic energy 1.8 eV and 4.0 eV, respectively. Find the value of λ1λ2.