Light review

What is the speed of light in a vacuum?

What is the unit of light intensity in the International System of Units (SI)?

• Candela

• Lumen

• Lux

• Watt

Which of the following best describes light intensity?

• The number of photons per second

• The power per unit area

• The energy per photon

• The speed of light

What is the relationship between light intensity and distance from the source?

• Intensity increases with distance

• Intensity decreases with distance

• Intensity remains constant

• Intensity is independent of distance

Which of the following is a correct expression for the speed of light in a vacuum?

What is the effect of increasing the frequency of a light wave on its wavelength, assuming the speed of light remains constant?

• Wavelength increases

• Wavelength decreases

• Wavelength remains the same

• Wavelength becomes zero

Which of the following statements is true about the speed of light in different media?

• The speed of light is the same in all media

• The speed of light is slower in a vacuum than in other media

• The speed of light is faster in a vacuum than in other media

• The speed of light is faster in water than in a vacuum