Properties of Light

In a vacuum, the speed of light

• is exactly the same for all light.

• depends on the light’s intensity.

• depends on the light’s wavelength.

• depends on the light’s frequency.

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Scientists use _____________ or _____________ to distinguish light waves from each other.

• speed, frequency

• wavelength, amplitude

• wavelength, frequency

• frequency, intensity

The longer a wave’s wavelength,

• the stronger its intensity.

• the higher its frequency.

• the slower the wave moves.

• the lower its frequency.

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Scientists often describe the color of visible light is using its

• speed

• wavelength

• intensity

• amplitude

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How do violet light waves compare to red light waves?

• They have a higher frequency and a higher speed.

• They have a higher frequency and a larger amplitude.

• They have a higher frequency and a shorter wavelength.

• They have a lower frequency and a shorter wavelength.

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The electromagnetic spectrum includes light waves of what frequencies and wavelengths?

• only visible light waves

• only light waves humans cannot see

• waves with a higher frequency than visible light

• all light waves

______________________ waves have the longest wavelengths.

• Gamma

• Gamma

• Radio

• X-ray

Gamma rays

• have lower frequencies than x-rays.

• have a shorter wavelength than violet light.

• travel faster than radio waves through a vacuum.

• are less dangerous to human health than visible light.

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Which of the following is true of rainbows?

• They form when white light is refracted by certain media.

• Rainbows can only be formed by prisms and water in the air.

• The less colors spread and scatter, the more visible the rainbow.

• The medium changes the frequency of the light passing through it to form a rainbow.

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Why is the sky blue?

• Sunlight is scattered by nitrogen molecules in the air.

• Blue and violet light scatters more than low-frequency colors.

• The light scatters in many directions rather than straight down.

• All of the above.