Question

1. What properties can be calculated knowing the intensity of light and constants?

☐ Magnetic Field      ☐ Electric Field       ☐ Energy Density       ☐ All of these

2. Why does light create radiation pressure?

☐ Conservation of momentum

☐ From the increase in temperature from absorbing light            

☐The electric field of the light increases the speed of matter     

☐ The magnetic field of light exerts a force on the electrons

3. How much does the intensity of unpolarized light decrease from a polarizing filter?

☐ It is completely blocked           ☐ Decreases by 1/4

☐ Decreased by 1/2                       ☐ Depends on the angle of the filter

4. What is not an application of polarization?

☐ Liquid Crystal Displays        ☐ Solar Sail        ☐ Sunglasses        ☐ Reflected surfaces

5. What feature of a wave can be used to create a wave front?

☐ Peaks        ☐ Troughs        ☐ Zero crossings        ☐ All of these

Answer 1

1) by knowing the intensity of of light and constants , we can calculate all three given quantities that is magnetic field , electric field and energy density according to the following formulae:

where I is the intensity , E is the electric field

where I is the intensity and B is the magnetic field

now, since we know the value of E from above formula, we can easily calculate the energy density(U) by the following formula

2) light create radiation pressure because of conservation of momentum, that is the momentum carried by the em wave is being exchanged with the particles and hence a pressure is created which is known as radiation pressure.

3)whenever an unpolarised light passes through a polariser , its intensity always decrease by 50%, that is "the intensity decreases by a factor of 1/2"

4) Solar sail is not an application of polarization.

Please ask your doubts or queries in the comment section below.

Please kindly upvote if you are satisfied with the solution.

Thank you.