Understanding the Electromagnetic Spectrum

What determines the color we perceive an object to be?

• The object's temperature

• The object's size

• The object's distance from the observer

• The wavelength of light it reflects

Which of the following is a common use of radio waves?

• Cooking food

• Transmitting data between wireless devices

• Detecting heat loss in homes

• Treating skin conditions

How do microwaves heat food?

• By reflecting off the surface

• By penetrating and heating water molecules inside the food

• By vibrating the food particles

• By heating the air around the food

What is a potential danger of ultraviolet (UV) rays?

• They can cause metal to rust

• They can interfere with radio signals

• They can cause sunburn and cell damage

• They can cause food to spoil

What is a unique property of gamma rays?

• They are used in night-vision goggles

• They have extremely high energy

• They are visible to the human eye

• They have the longest wavelengths