Aparticular metal has a work function of 1.05 ev. a light is shined onto this metal with a corresponding wavelength of 324 nm. what is the maximum velocity of the photoelectrons produced? (hint: 1ev = 1.6022 x 10-19 j, mass of an electron = 9.11 x 10-31 kg)

Velocity of electron will be              

Explanation:

We have given work function of metal

Wavelength of the light

So energy is given by , here h is plank's constant and c is speed of light

So

For a metal we know that

So

Now kinetic energy is given by

So velocity of electron will be

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .