Luminescence is because of
Options:
(a) Photons emitted while excited electrons drops down
(b) Knocking out of electrons by photons
(c) Photons stimulated by photons
(d) All
1 Answers
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A lift is moving down with acceleration a. A man in the lift drops a ball inside the lift.
(c) : For observer in the lift, acceleration = (g – a) For observer standing outside, acceleration = g.
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Pick the correct options. (a) All electrons have magnetic moment.
(a) All electrons have magnetic moment. (b) All protons have magnetic moment.
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Let nr and nb be respectively the number of photons emitted by a red bulb and a blue bulb of equal power in a given time.
(c) Red bulb and a blue bulb of equal power in a given time nr > nb.
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When the intensity of a light source is increased, (a) the number of photons emitted by the source in unit time increases
(a) the number of photons emitted by the source in unit time increases (b) the total energy of the photons emitted per unit time increases
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What is the stopping potential of a photocell, in which electrons with a maximum kinetic energy of 6eV are emitted?
Ek = eV0 => 6eV = eV0 => V0 = 6V The stopping potential V0 = 6volt (negative)
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Jhoolan put a few drops of lemon juice in Jhumpa’s mouth. Do you think we can make our the taste with just a few drops.
Yes. A few drops of sour things like lemon is enough to make out the taste.
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A gas of hydrogen-like ions is prepared in a particular excited state A. It emits photons having wavelength equal to the wavelength
a) The gas emits 6 wavelengths, let it be in nth excited state. => n(n-1)/2=6=>n=4 So, The gas is in 4th excited state. b) Total no.of wavelengths in the transition is 6. We have ...
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Electrons are emitted from an electron gun at almost zero velocity and are accelerated by an electric field E through a distance of 1.0 m.
The given wavelength in Balmer series. The first line, which requires minimum energy is from n1 = 3 to n2 = 2. The energy should be equal to the energy required for...
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There are materials which absorb photons of shorter wavelength and emit photons of longer wavelength.
In the first case energy given out is less than the energy supplied. In the second case, the material has to supply the energy as the emitted photon has more...
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Which one of the following cannot emit radiation and why? Excited nucleus, excited electron.
Excited electron because energy of electronic energy levels is in the range of eV, only not in MeV. as γ -radiation has energy in MeV.
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