Electromagnetic Waves and Energy Density

What are electromagnetic waves composed of?

• Sound waves and light waves

• Electric fields and magnetic fields

• Protons and electrons

• Mechanical waves and gravitational waves

What is the energy density (energy per unit volume) of an electric field?

• 1/2 CV^2

• 1/2 LI^2

• ε₀E²/2

• B²/(2μ₀)

What is the energy density (energy per unit volume) of a magnetic field?

• 1/2 CV^2

• 1/2 LI^2

• ε₀E²/2

• B²/(2μ₀)

How is the total energy density of an electromagnetic wave determined?

• By multiplying the energy densities of the electric and magnetic fields.

• By subtracting the magnetic field energy density from the electric field energy density.

• By adding the energy densities of the electric and magnetic fields.

• By dividing the electric field energy density by the magnetic field energy density.

What is the total energy density (U_T) of an electromagnetic wave, given the electric field energy density (U_E) and magnetic field energy density (U_B)?

• U_T = U_E - U_B

• U_T = U_E + U_B

• U_T = U_E * U_B

• U_T = U_E / U_B

How are the magnitudes of the magnetic field (B) and electric field (E) related in a traveling electromagnetic wave, where C is the speed of light?

• B = E * C

• B = C / E

• B = E / C

• B = E + C

Which expression correctly represents the speed of light (C) in a vacuum, where ε₀ is the permittivity of free space and μ₀ is the permeability of free space?

• C = sqrt(ε₀ * μ₀)

• C = 1 / (ε₀ * μ₀)

• C = 1 / sqrt(ε₀ * μ₀)

• C = ε₀ * μ₀

In a traveling electromagnetic wave, how does the energy density contributed by the electric field compare to the energy density contributed by the magnetic field?

• The electric field contributes more energy density.

• The magnetic field contributes more energy density.

• Both fields contribute equal energy density.

• The energy contribution depends on the medium.