Electromagnetic Waves and Light Properties

What is the speed of electromagnetic waves in a vacuum?

• 150,000 kilometers per second

• 300,000 kilometers per second

• 450,000 kilometers per second

• 600,000 kilometers per second

What type of waves are electromagnetic waves?

• Longitudinal waves

• Transverse waves

• Surface waves

• Mechanical waves

What allows electromagnetic waves to travel through empty space?

• Their speed

• Their frequency

• Their ability to travel as electric and magnetic disturbances

• Their wavelength

What happens to shorter wavelengths of light when they enter a prism?

• They are absorbed.

• They refract more than longer wavelengths.

• They reflect back.

• They remain unchanged.

What is the result of refraction when light enters glass?

• Light is absorbed.

• Light is reflected.

• Light is bent in a new direction.

• Light remains unchanged.

What determines the brightness of light?

• Frequency of the wave

• Amplitude of the wave

• Wavelength of the wave

• Color of the wave

What is the primary focus of a sensor as mentioned in the Vocab Tip?

• To emit electromagnetic waves

• To measure or detect a physical property

• To change the color of light

• To increase the frequency of waves

What can thermal imaging devices reveal?

• Visible light from objects

• Infrared emitted by nearby objects or landscapes

• Ultraviolet light from the sun

• Radio waves from cell towers

What is the relationship between wavelength and frequency in X-rays and gamma rays?

• Longer wavelengths have higher frequencies

• Shorter wavelengths have higher frequencies

• Wavelength and frequency are unrelated

• Longer wavelengths have lower frequencies

What is the term for the height of a wave from its rest position?

• Wavelength

• Amplitude

• Frequency

• Crest