Density = mass / volume
mass = density x volume
m = 0.917 x 2.5
m = 2.29 grams
(3) Gamma has the greatest penetration power. Alpha has low and both beta and positron have medium. Hope I helped :)
The correct answer is
Energy of electrons depends on light’s frequency, not intensity.
As per photoelectric effect, if we incident a light on metal surface it will results into emission of electron from it
if we increase the number of photons the number of electrons will increase however if we increase the frequency the number of photons will not increase
While if we increase frequency the energy of electrons will increase as
Energy of photon = Work function of metal + kinetic energy of electrons
Explanation:
example is copper iron...........
