Recent content by Jimmy Moriaty

No need of minus sign dear. Minus sign represents the direction. But question don's ask a direction. So remove the minus sign. Then it'll be okay.:smile:

No. It's mean very very large value. Always there is a potential greater than which we are considering. Potential is a function of space. Since space is never ending then potential is also never ending. Therefore we're talking about an infinite potential.:wink:

J/K represents the energy that increases when the temperature increased by 1 unit. Simply entropy describes the instability of a system.(That's energy :smile:)

Thank you everyone!

Yeah! You are right.There is a difference between those two velocities. I've chose the wavelength of 0.071nm x-rays. When I consider the E=Pc & P=mv I've got v=1.025*10^7 ms^-1 But when i chose E=Pc & E=1/2 mv^2 it's v=7.84*10^7 ms^-1 But what's the reason for this?

Then,why can't electron travel the same direction which the photon have been travelled? (after absorbing the energy of photon) Then, why can't electron travel the same direction which the photon have been travelled?(after absorbing the energy of photon)

But in the photo-electric effect it's happeing.why?

Please tell me,why can't a photon transfer it's energy completely to a free electron?