Electromagnetic Waves EM Spectrum

What is the source of electromagnetic waves according to Maxwell?

• Moving charges

• Stationary magnetic fields

• Oscillating charges

• Static charges

Why is it challenging to generate electromagnetic waves in the visible spectrum?

• Visible spectrum requires a vacuum

• Visible spectrum waves are too weak

• Modern circuits can't reach the required frequencies

• Visible spectrum frequencies are too low

How do electromagnetic waves travel according to Maxwell's equations?

• Parallel to electric fields

• Perpendicular to electric and magnetic fields

• In a circular motion

• In a straight line

What is the relationship between frequency, wavelength, and speed of an electromagnetic wave?

• Speed = Frequency + Wavelength

• Speed = Frequency x Wavelength

• Speed = Frequency / Wavelength

• Speed = Wavelength / Frequency

What distinguishes electromagnetic waves from sound and water waves?

• They require a medium to travel

• They are slower than sound waves

• They can travel in a vacuum

• They are visible to the human eye

What was the historical belief about the medium for electromagnetic waves?

• They travel through ether

• They travel through air

• They travel through solid matter

• They travel through water

How does permittivity affect electromagnetic waves in a medium?

• Higher permittivity decreases electric field

• Higher permittivity has no effect

• Higher permittivity increases electric field

• Higher permittivity increases wave speed

What is the significance of the speed of light in vacuum?

• It varies with frequency

• It is a fundamental constant

• It depends on the medium

• It is slower than sound

What is radiation pressure?

• Pressure exerted by electromagnetic waves

• Pressure exerted by gravitational waves

• Pressure exerted by water waves

• Pressure exerted by sound waves

How do electromagnetic waves carry energy?

• By compressing air

• By oscillating electric and magnetic fields

• Through a material medium

• By displacing water