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If light of wavelength lambda is incident on metal surface, the ejected fastest electron has speed v. If the wavelength is changed to 3/4(lambda), the speed of the fastest emitted electron will be?
Explain zero force acting on a wire which is not carrying current,on being placed inside a magnetic field.
Asked Praagy Shukla
A charge at rest will not experience any force in a magnetic field, but a moving charge will experience a force unless it is moving parallel to the field.
In a conductor, the electrons are in rapid and random motion, but the conductor will not experience a force until a current is passing through it. (Even though the electrons are not at rest). This is because, in the absence of a current, the motion of electrons is random and there is no net drift of electrons in any direction. Thus the forces cancel out.
When a current is passed through the wire, there is a net drift and hence a net force is experienced by the current carrying conductor in a magnetic field.
Further, I want to mention that the force is experienced between the existing field and the field produced by the moving charges/ current.
We say current flow opposite to electron flow but what is current?
Electric current is defined as the rate of flow of charges, ie; the amount of charges flowing in 1 sec.
The mass of a proton is 1840 times that of an electron. it is accelerated to a potential difference of 1kV. find the amount of work done in process. (Ujjwal Sharma asked)
The work done = the KE acquired = eV=1.6 x 10-19 x 1000 = 1.6 x 10-16 J
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Why an electron in level N when it gain energy it go to a higher energy level , why not going to a lower energy level , considering that word “higher” and “lower” refers to no of energy level but the energy of the energy level decrease as we go away from nucleus so an excited electron that gain an additional energy transfer to a higher energy level in no but lower in energy so why the electron doesn’t from its level to a lower energy level in no but higher in energy so the new energy level can bear the energy of the excited electron ?
The question is not very clear. If you can explain it further, it will be better to discuss here.
Neeraj asks: ”We have read that atoms can neither been created nor been destroyed!
I want to know from where atoms came in existence,if they can not been created,also atom contain electron and proton which are negatively and positively charged,i want to know from where these charge came?”
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