Monochromatic electromagnetic radiation illuminates an area of a surface. The electric and magnetic fields of the waves are then doubled in magnitude. How is the total energy incident on the surface per unit time affected by this increase in the electric and magnetic fields

Complete Question

Monochromatic electromagnetic radiation illuminates an area of a surface. The electric and magnetic fields of the waves are then doubled in magnitude. How is the total energy incident on the surface per unit time affected by this increase in the electric and magnetic fields?

(a) The total energy is not affected by this change.

(b) The total energy will increase by a factor of two.

(c) The total energy will increase by a factor of four.

(d) The total energy will decrease by a factor of two.

(e) The total energy will decrease by a factor of four.

(c) The total energy will increase by a factor of four.

Explanation:

Generally the total energy is directly proportional to the square of the amplitude of the (electric and magnetic field of the wave ) , this can be mathematically represented as

         \

=>        

Here k is a constant

=>        

=>        

Now when the amplitude of( electric and magnetic fields) are doubled, i.e when  

=>    

=>    

So we see that the total energy increase by

gpe = mass x gravity constant x height or… gpe = mgh

where… mass: measured in kilograms (kg)

gravity: gravity constant on earth = 10.00 m/s2

height: measured in meters (m)

gpe: measured in joules (j) or kilojoules (kj)

how do you solve gpe?

gravitational potential energy (gpe) is the energy an object has because of its position above the. ground.

gpe = mass x gravity constant x height or… gpe = mgh.

mass:

note: to earn full marks when solving science word problems, you must show your work:

formula.

example:

given values:

mass = 0.3 kg.