Electromagnetic Spectrum and Its Effects

The video introduces the electromagnetic spectrum, explaining its various parts and their uses. It covers radio waves for communication, microwaves for cooking and satellite communication, infrared for heat sensing, visible light for color perception, ultraviolet light for tanning and lighting, and x-rays and gamma rays for medical imaging. The video concludes with a call to action for viewers to engage with the content.

What is the speed of light in terms of its ability to travel around the Earth?

• Sixteen times in a second

• Eight times in a second

• Four times in a second

• Once in a second

Which part of the electromagnetic spectrum is used for TV communication?

• Microwaves

• Infrared

• Radio waves

• Ultraviolet

How do microwaves heat food?

• By making water molecules vibrate

• By penetrating deep into the food

• By using visible light

• By heating the air around the food

Which part of the spectrum is first detectable by animals?

• Microwaves

• Infrared

• Ultraviolet

• Radio waves

What technology uses visible light to transmit data to homes?

• X-ray imaging

• Microwave ovens

• Fibre optic wave guides

• Satellite communication

What effect does ultraviolet light have on human skin?

• Heals it

• Cools it down

• Makes it glow

• Causes it to tan

Which type of light is used in energy-efficient fluorescent lamps?

• Visible

• Infrared

• Gamma rays

• Ultraviolet

What is a potential health risk of exposure to ultraviolet light?

• Improved vision

• Increased energy

• Cell damage leading to cancer

• Enhanced immune system

What is a common use of x-rays in the medical field?

• Tanning skin

• Heating food

• Detecting tumors

• Transmitting data

Which type of rays can be used to target and destroy tumors?

• Radio waves

• Gamma rays

• Microwaves

• Infrared