EM Waves

Which electromagnetic wave has the shortest wavelength?

• Radio waves

• Microwaves

• Gamma rays

• Infrared

What is the nature of the wave in electromagnetic waves?

• Longitudinal

• Transverse

• Surface

• Mechanical

Which of the following is true about electromagnetic waves?

• They cannot travel through a vacuum

• They travel at different speeds in a vacuum

• They all travel at the same speed in a vacuum

• They require a medium to travel

What is the effect of higher frequency on the wavelength of a wave?

• Shortens wavelength

• Lengthens wavelength

• No effect

• Doubles wavelength

What is the primary advantage of using infrared cameras in the dark?

• They can see through walls

• They can detect heat without visible light

• They can emit sound waves

• They can capture color images

What is the significance of infrared radiation reflecting off objects?

• It allows the camera to detect the objects

• It absorbs into the objects

• It changes the color of the objects

• It creates sound waves

When is the second type of infrared camera typically used?

• To find or track people or animals

• To capture underwater images

• To photograph stars

• To detect sound waves

Which type of radiation is located between radio waves and infrared?

• Microwaves

• Ultraviolet

• X-rays

• Gamma rays

Which type of radiation is mostly absorbed by the ozone layer?

• Infrared

• Ultraviolet

• X-rays

• Gamma rays

What is the primary source of energy that affects the Earth's atmosphere?

• The Moon

• The Sun

• The Stars

• The Ocean