Electromagnetic radiation of 5.16ă—1016 hz frequency is applied on a metal surface and caused electron emission. determine the work function of the metal if the maximum kinetic energy (ek) of the emitted electron is 4.04ă—10-19 j.

Work function of the metal,

Explanation:

We are given that  

Frequency of the electromagnetic radiation,   Hz

The maximum kinetic energy of the emitted electron,

We need to find the work function of the metal.

We know that the maximum kinetic energy of ejected electron

Where h=Plank's constant=

=Frequency of light source

=Work function

Substitute the values in the given formula  

Then, the work function of the metal is given by :

So, the work function of the metal is . Hence, this is the required solution.

explanation:

the masses of the objects and the distance between them

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.