Understanding Light and the Electromagnetic Spectrum

What is the primary source of information about the universe?

• Light

• Sound

• Gravity

• Magnetism

How can light be defined in terms of energy?

• As a particle

• As a wave

• As a form of energy that propagates as a wave

• As a magnetic field

What determines the energy of an electromagnetic wave?

• Its amplitude

• Its speed

• Its wavelength and frequency

• Its direction

Which type of electromagnetic wave has the longest wavelength?

• Gamma rays

• Radio waves

• Visible light

• Infrared

How do microwaves heat food?

• By creating sound waves

• By emitting visible light

• By ionizing atoms

• By vibrating water molecules

What is the range of wavelengths for visible light?

• 1-10 nm

• 700-1000 nm

• 380-700 nm

• 100-300 nm

Which type of radiation is most harmful to humans?

• Radio waves

• Infrared

• Gamma rays

• Ultraviolet

What protects us from most of the Sun's ultraviolet radiation?

• Clouds

• The ozone layer

• The Earth's magnetic field

• The atmosphere

What is the primary use of X-rays in medicine?

• To treat cancer

• To monitor heart rate

• To diagnose bone fractures

• To measure blood pressure

What happens when an electron moves from a higher energy state to a lower energy state?

• It loses mass

• It becomes a proton

• It absorbs light

• It emits light