5.8 Understanding Ultraviolet Light and Its Effects

What is the primary reason ultraviolet light appears similar to visible light?

• They are both forms of electromagnetic radiation.

• UV light has longer wavelengths than visible light.

• They are both absorbed by the atmosphere.

• UV light is visible to the human eye.

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Why do certain glasses appear almost black under UV light?

• They scatter UV light.

• They are transparent to UV light.

• They absorb a significant amount of UV light.

• They reflect all UV light.

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What property makes tonic water appear bright under a UV lamp?

• It has no special properties under UV light.

• It contains quinine which fluoresces under UV light.

• It is mixed with sugar.

• It contains carbonated water.

How do laundry detergents use UV light to appear brighter?

• By scattering UV light.

• By completely absorbing UV light.

• By reflecting UV light.

• By converting UV light to visible light.

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What misleading effect can UV light have on the perception of certain flowers?

• It makes all flowers appear darker.

• It has no effect on the appearance of flowers.

• It makes them appear the same as in visible light.

• It can reveal patterns invisible to the human eye.

What role does melanin play in protecting the skin from UV rays?

• It reflects UV rays away from the skin.

• It absorbs UV rays, protecting deeper skin layers.

• It scatters UV rays across the skin surface.

• It allows UV rays to pass through harmlessly.

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How does UV light help in counting animal populations in snowy environments?

• It reflects off the snow, creating a contrast.

• It highlights the animals against the snow.

• It causes the animals to glow.

• It is absorbed by the animals, making them easier to spot.

What is a practical application of UV photography in wildlife studies?

• It helps in identifying plant species.

• It assists in tracking nocturnal animals.

• It is used to count specific animal populations.

• It is used to study underwater ecosystems.

Why is sunscreen important in environments with high UV exposure?

• It reflects all UV light.

• It makes the skin appear darker.

• It cools the skin.

• It converts UV light into heat, reducing potential damage.

What is the effect of Rayleigh scattering on the appearance of the sky in UV light?

• It makes the sky appear completely clear.

• It creates a foggy, hazy appearance.

• It has no effect on the appearance of the sky.

• It makes the sky appear darker.

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