Electromagnetic Spectrum

What is the significance of the electromagnetic spectrum in communication technology?

• It is used exclusively for satellite communications.

• It allows for the transmission of data over fiber optic cables.

• Different frequencies are used for radio, television, mobile phones, and satellite communications.

• It has no impact on modern communication technologies.

What is the difference between electromagnetic waves and mechanical waves?

• Electromagnetic waves can travel through a vacuum, while mechanical waves require a medium (like air or water) to propagate.

• Mechanical waves can travel through a vacuum, while electromagnetic waves require a medium to propagate.

• Both electromagnetic and mechanical waves can travel through a vacuum without any medium.

• Electromagnetic waves are slower than mechanical waves in all mediums.

What happens to frequency as wavelength increases?

• Frequency increases

• Frequency decreases

• Frequency remains constant

• Frequency fluctuates randomly

What is the speed of all electromagnetic waves in a vacuum?

• 2 x 10^8 meters per second

• 3 x 10^8 meters per second

• 4 x 10^8 meters per second

• 5 x 10^8 meters per second

What is infrared radiation?

• A type of electromagnetic radiation with wavelengths longer than visible light but shorter than microwaves, commonly associated with heat.

• A type of sound wave that is inaudible to humans.

• A form of radiation that is visible to the human eye.

• A type of radiation that causes skin burns and is used in tanning beds.

What is the electromagnetic spectrum?

• The range of all types of electromagnetic radiation, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.

• A type of sound wave that travels through the air.

• A spectrum of colors visible to the human eye only.

• The range of all types of mechanical waves, including sound and seismic waves.

What type of electromagnetic wave is used in remote controls?

• Ultraviolet waves

• Infrared waves

• Microwaves

• Radio waves

What is visible light?

• The portion of the electromagnetic spectrum that is visible to the human eye, typically ranging from wavelengths of about 400 nm (violet) to 700 nm (red).

• A type of radiation that is not visible to the human eye, such as ultraviolet or infrared light.

• Light that is emitted by the sun and can be seen during the day.

• A form of energy that travels in waves but does not interact with the human eye.

What type of electromagnetic wave has the lowest energy?

• Microwaves

• Gamma rays

• X-rays

• Ultraviolet rays

What type of electromagnetic wave has the highest energy?

• Radio waves

• Microwaves

• Gamma rays

• Infrared waves