Ametal with a threshold frequency of 1.40×1015
s
−1
emits an electron with a velocity of 7.79×105
m/s
when radiation of 1.80×1015
s
−1
strikes the metal.

calculate the mass of the electron.

The  mass of the electron is

Explanation:

Photoelectric effect is given by  

where ν0 = threshold frequency of given metal =

ν = given radiation =

v = velocity of emitted electron = given =

m = required mass of electron

h = Plank’s constant =

Substituting the values in the formula  

Solving this we get m =

which is the mass of the electron.

i think   the answer is c hope i'm right

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?