Electromagnetic Waves

Electromagnetic waves are produced by

• Static charges

• Accelerated charges

• Moving charges at constant velocity

• Magnetic dipoles

Which of the following has the shortest wavelength?

• Radio waves

• Microwaves

• X-rays

• Infrared radiation

The speed of electromagnetic waves in a vacuum is approximately

• 3×10⁶m/s

• 3×10⁸m/s

• 3×10¹⁰ m/s

• 3×10¹²m/s

Which of the following electromagnetic waves has the highest frequency?

• Visible light

• Gamma rays

• Ultraviolet radiation

• Infrared radiation

The wavelength of visible light ranges approximately between

• 10⁻³m to 10⁻⁴ m

• 700nm to 400 nm

• 1mm to 10⁻⁶ m

• 1m to 10⁻³ m