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A monochromatic electromagnetic wave propagates in vacuum. If its electric field amplitude is and magnetic field amplitude is , which of the following relations is NOT correct?
E₀ = cB₀
The energy density is equally distributed between electric and magnetic fields
E₀B₀ = c
The directions of E, B and propagation are mutually perpendicular
An electromagnetic wave has a frequency and wavelength in a medium with refractive index . If the same wave enters vacuum, which quantity remains unchanged?
Frequency
Wavelength
Speed
Both wavelength and speed
A plane electromagnetic wave propagates in vacuum. The electric field is given by . What is the magnitude of the associated magnetic field?
E_0/c
cE_0
E_0/ω
ωE_0
Which of Maxwell's equations predicts the existence of electromagnetic waves?
Gauss's Law for Electricity
Gauss's Law for Magnetism
Faraday's Law
Both Ampere-Maxwell's Law and Faraday's Law
What is the relationship between wavelength and frequency of electromagnetic waves?
Directly proportional
Inversely proportional
No relationship
Exponentially related
The energy of an electromagnetic wave is directly proportional to its:
Wavelength
Amplitude
Frequency
Speed
Electromagnetic waves are transverse waves because:
They can travel through vacuum.
The oscillating electric and magnetic fields are perpendicular to the direction of propagation.
They travel at the speed of light.
They can be polarized.
The electric field E and magnetic field B in an electromagnetic wave are related. In a vacuum, which of the following is true?
E and B are parallel to each other and to the direction of propagation.
E and B are perpendicular to each other but parallel to the direction of propagation.
E and B are parallel to each other and perpendicular to the direction of propagation.
E and B are perpendicular to each other and to the direction of propagation.
In an electromagnetic wave, the ratio of the magnitude of the electric field (E) to the magnitude of the magnetic field (B) is equal to:
The permeability of free space ()
The permittivity of free space ()
The speed of light (c)
Zero
If the electric field in an electromagnetic wave is given by , what is the direction of propagation of the wave?
Positive x-direction
Negative x-direction
Positive y-direction
Negative y-direction
