How many grams of NO2 are in 3 moles of a nitrogen dioxide???90.2g138.2g160g0.07g
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For a point charge, The potential varies inversely with distance from the point charge r, that is Potential V ∝
A point charge is defined as a charge that neither has mass nor volume, that is it exists as a single point.
The point charge with respect to the electric potential should be expressed in
V = KQ/r
Here we can say that the electric potential should be varied oppositely to the distance
Electric potential is defined as the amount of work needed to bring a charge from infinity to a certain place in opposition to electrostatic force. Only when there is a potential gradient at the conductor's ends do electrons travel across it.
Refer to more about potential here
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The minimum frequency to extract an electron is D)
Explanation:
The equation for the photoelectric effect is:
where
(hf) is the energy of the incident photon, where
is the Planck constant
f is the photon frequency
is the work function of the material
is the maximum kinetic energy of the ejected electron
The minimum frequency of the light needed to extract an electron fro mthe surface of the material can be found by requiring that the maximum kinetic energy of the photoelectron is zero:
So we get
For silver, the work function is
Solving for f, we find the minimum frequency:
Learn more about photoelectric effect:
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