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The ratio between the first three orbits of a hydrogen atom is ______.
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If the nuclear radius of 27Al is 3.6 fermi, the approximate unclear radius of 64 Cu is ______.
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The wavelength λe of an electron and λp of a photon of same energy E are related by ______.
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The wave associated with a moving particle of mass 3 × 10–6 g has the same wavelength as an electron moving with a velocity 6 × 106 ms–1. The velocity of the particle is
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If a light of wavelength 330 nm is incident on a metal with work function 3.55 eV, the electrons are emitted. Then the wavelength of the wave associated with the emitted electron is (Take h = 6.6 × 10–34 Js)
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Emission of electrons by the absorption of heat energy is called ____________ emission.
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Why do metals have a large number of free electrons?
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Define the work function of a metal. Give its unit.
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What are the shapes of wavefront for source at infinite?
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What do you mean by electron emission? Explain briefly various methods of electron emission.
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I0 is the intensity of light existing between two cross Polaroids kept with their axes perpendicular to each other. A third polaroid is introduced between them. What must be the angle between the axes of the first and the newly introduced polaroid to get the maximum light from the whole arrangement?
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A 150 W lamp emits light of the mean wavelength of 5500 Å. If the efficiency is 12%, find out the number of photons emitted by the lamp in one second.
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Name some equipment that uses electromagnetism for functioning.
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Sea turtles return to their birth beach many decades after they were born due to ______.
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A wire connected to a power supply of 230 V has power dissipation P1. Suppose the wire is cut into two equal pieces and connected parallel to the same power supply. In this case, power dissipation is P2. The ratio of `"P"_2/"P"_1` is
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Define Current density.
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State microscopic form of Ohm’s law.
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State macroscopic form of Ohm’s law.
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What is non ohmic device?
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