When 1 kg of ice at 0⁰C melts to water at 0⁰C, the resulting change in its entropy
When 1 kg of ice at 0⁰C melts to water at 0⁰C, the resulting change in its entropy, taking latent heat of ice to be 80 cal/⁰C, is
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(a) 273 cal/K (b) […]
AIPMT2011
A parallel plate condenser has a uniform electric field E(V/m) in the space between
A parallel plate condenser has a uniform electric field E(V/m) in the space between the plates. If the distance between the plates is d(m) and area of each plate is A(m²) the energy (joules) stored […]
A charge Q is enclosed by a Gaussian spherical surface of radius R
A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the outward electric flux will
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(a) increase four times (b) be reduced to […]
If a small amount of antimony is added to germanium crystal
If a small amount of antimony is added to germanium crystal
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(a) it becomes a p-type semiconductor (b) the antimony becomes an acceptor atom (c) there will be more free electrons than […]
In forward biasing of the p-n junction
In forward biasing of the p-n junction
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(a) the positive terminal of the battery connected to p-side and the depletion region becomes thick (b) the positive terminal of the battery is connected […]
In photoelectric emission process from a metal of work function
In photoelectric emission process from a metal of work function, 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is
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(a) 1.8 V (b) 1.2 […]
Electrons used in an electron microscope are accelerated by a voltage of 25 kV
Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage is increased associated to 100 kV then the de-Broglie wavelength associated with the electrons would
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Light of two different frequencies whose photons have energies 1eV
Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively illuminate a metallic surface whose work function is 0.5 eV successively. Ratio of maximum speed of emitted electrons will be […]
In the Davisson and Germer experiment, the velocity of electrons emitted from the
In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by
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(a) increasing the potential difference between the anode and filament (b) increasing the […]
Photoelectric emision occurs only when the incident light has more than a certain minimum
Photoelectric emision occurs only when the incident light has more than a certain minimum
Options
(a) power (b) wavelength (c) intensity (d) frequency
Correct Answer:
frequency
Explanation:
For occurence of photoelectric effect, the […]