When a surface is illuminated with electromagnetic radiation of wavelength 480 nm, the maximum kinetic energy of the emitted electrons is 0.54 ev. what is the maximum kinetic energy if the surface is illuminated using radiation of wavelength 340 nm?

Max kinetic energy for 340 nm wavelength will be

Explanation:

In first case wavelength of electromagnetic radiation

Plank's constant

Maximum kinetic energy = 0.54 eV

Energy is given by

We know that energy is given

, here is work function

So

Now wavelength of second radiation = 340 nm

So energy

So

given data:

determine the horse power (h.p) = ?

force applied to move the box(f) = 10 pounds,

box lifted from a distance         (d) = 3 feet

time taken to lift                         (t) = 10 sec,

the horse power is defined as amount of work required to move a load. the horse power is equal to 550 foot-pound per second

                  1 h.p   = 550 foot-pound/second

it can also be defined as the the load that need to be move a body for certain distance in a certain amount of time.

mathematically,

                      h.p = (force × distance)/ time

                            = (10 × 3)/ 10

                            = 30/10

                            = 3 foot -pound/sec

hence, the horse power is needed to move the box is 3 foot-pound/second

important note: 1 h.p = 550 foot-pound/second = 746 watts

there are no contact forces mentioned on the list of choices that you've provided.