Answer:
The energy of each photon in the light beam is
.
Explanation:
Given that,
Index of refraction of glass =1.55
Index of refraction of material =1.30
Wavelength = 115 nm
We need to calculate the energy of each photon in the light beam
Using formula of energy

Where, h = Planck constant
=wavelength
c = speed of light
Put the value into formula


Hence, The energy of each photon in the light beam is
.
The electric potential energy of this system of charges will be +1.44 J. Option E is correct.
<h3>What is the electric potential energy ?</h3>
Electric potential energy stands for the energy that is required to displace a charge in against an electric field.
Given data;
q₁ = 4. 0 µc
q₂ = -8. 0 µc
D(distance between charges) = 0.2 m
The electric potential energy is found as;

The electric potential energy of this system of charges will be +1.44 J.
Hence,option E is correct.
To learn more about the electric potential energy refer:
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Answer:
Mechanical energy
Explanation:
A car changes chemical energy from fuel into thermal energy and mechanical energy.
Mechanical energy can be defined as the type of energy that is possessed by an object due to its motion or position. Mechanical energy is the sum of potential energy and kinetic energy, that is, the sum of energy in motion and stored energy. Examples of mechanical energy includes driving a car, riding a bicycle, listening to music etc.
Types of mechanical energy
1. Motion energy (kinetic energy)
2. Stored energy(potential energy)
Mechanical energy = Kinetic energy + Potential energy