Which of the following figures represents the variation of the particle momentum and the associated deBroglie wavelength?
1. | 2. | ||
3. | 4. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA photoelectric surface is illuminated successively by monochromatic light of wavelengths λ and λ/2. If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times that in the first case, the work function of the surface of the material will be:
(h = Planck’s constant, c = speed of light)
1. hc/2λ
2. hc/λ
3. 2hc/λ
4. hc/3λ
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyLight with a wavelength of 500 nm is incident on a metal with a work function of 2.28 eV. The de Broglie wavelength of the emitted electron will be:
1. <2.8x10-10 m
2. <2.8x10-9 m
3. \(\geqslant \)2.8x10-9 m
4. <2.8x10-12 m
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyLight with an energy flux of 25 x 104 Wm-2 falls on a perfectly reflecting surface at normal incidence. If the surface area is 15cm2 the average force exerted on the surface is
(1)1.25x10-6N
(2)2.5x10-6N
(3)1.2x10-6N
(4)3.0x10-6N
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology
When the energy of the incident radiation is increased by 20%, the kinetic energy of the photoelectrons emitted from a metal surface increases from 0.5 eV to 0.8 eV. The work function of the metal will be:
1. 0.65 eV
2. 1.0 eV
3. 1.3 eV
4. 1.5 eV
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology
What will be the percentage change in the de-Broglie wavelength of the particle if the kinetic energy of the particle is increased to 16 times its previous value?
1. 25
2. 75
3. 60
4. 50
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe wavelength \(\lambda_{e}\) of an electron and \(\lambda_{p}\) of a photon of the same energy E are related as:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 200W sodium street lamp emits yellow light of wavelength Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is
(1)
(2)
(3)
(4)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMonochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V.The threshold frequency of the material is:
(1)
(2)
(3)
(4)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAn particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of \(0.25 \mathrm{~Wb} / \mathrm{m}^2\). The de-Broglie wavelength associated with the particle will be:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology