Understanding Electromagnetic Waves

Why can radio waves penetrate walls while visible light cannot?

• Visible light travels faster than radio waves.

• Visible light has a longer wavelength than radio waves.

• Radio waves have higher energy than visible light.

• Radio waves have lower energy and do not excite electrons in walls.

Which part of the electromagnetic spectrum is responsible for cooking food?

• Radio waves

• Infrared

• Microwaves

• Ultraviolet

According to Planck's equation, what happens to photon energy as frequency increases?

• Photon energy remains constant.

• Photon energy decreases.

• Photon energy increases.

• Photon energy becomes zero.

What is the typical wavelength range for visible light?

• Centimeters

• Kilometers

• Meters

• Nanometers

Why do photons of visible light not penetrate walls?

• They are too large to pass through wall gaps.

• They are absorbed by the air before reaching the wall.

• They have energy comparable to electron transitions, causing scattering.

• They have too low energy to excite electrons.