Understanding the Electromagnetic Spectrum

What generates electromagnetic waves?

• Sound vibrations

• Electric and magnetic field vibrations

• Heat energy

• Mechanical vibrations

What are electromagnetic waves composed of?

• Electric fields only

• Magnetic fields only

• Both electric and magnetic fields

• Gravitational fields

How are the electric and magnetic fields oriented in an electromagnetic wave?

• Parallel to each other

• At a 45-degree angle

• Perpendicular to each other

• In the same direction

What unit is used to measure frequency in the electromagnetic spectrum?

• Watts

• Newton

• Hertz

• Joules

What is the range of frequencies in the electromagnetic spectrum?

• 200 kHz to 2x10^22 Hz

• 300 kHz to 3x10^21 Hz

• 100 kHz to 1x10^15 Hz

• 500 kHz to 5x10^20 Hz

What does the frequency of a wave indicate?

• The number of cycles per second

• The energy of the wave

• The amplitude of the wave

• The speed of the wave

Can electromagnetic waves travel through a vacuum?

• Yes, they can

• No, they cannot

• Only at low frequencies

• Only at high frequencies

Which electromagnetic wave has the longest wavelength?

• Gamma rays

• X-rays

• Visible light

• Radio waves

What is the wavelength size of microwaves compared to?

• A soccer field

• A baseball

• A water molecule

• A bacteria

Which color of visible light has the highest frequency?

• Yellow

• Red

• Blue

• Green