[NEW] Physical Science Quiz 8a

Define what photons are.

• Particles that reflect light in different directions

• Tiny packets of energy that emit electrons when light strikes a metal surface

•  Chemical compounds that change color under light

• Invisible rays that block ultraviolet light

Explain why ultraviolet light can cause skin damage while visible light typically does not.

• UV light has shorter wavelengths and higher energy than visible light

• Visible light reflects off the skin, while UV light is absorbed

• UV light cannot pass through the Earth’s atmosphere

• Visible light generates heat that protects the skin from damage

How can you demonstrate the photoelectric effect using a simple experiment or model?

• Shine red light on a metal surface and observe emitted electrons

• Use a blue light to illuminate a metal and observe the emitted electrons

• Place two mirrors opposite each other to demonstrate reflection

• Use polarized lenses to block UV light

Compare and contrast how rods and cones in the human eye process light and color. What is one key difference?

• Rods are responsible for color vision, and cones are responsible for black-and-white vision

• Rods are sensitive to dim light, and cones detect color in brighter light

• Rods detect ultraviolet light, and cones detect infrared light

• Rods reflect light, while cones absorb all light

Do you agree with the assertion that light behaves both as a wave and a particle? Justify your answer with scientific evidence.

• Yes, because the photoelectric effect proves light behaves as particles, and interference patterns prove wave behavior

• No, because light only behaves as particles under all conditions

• Yes, because light’s speed changes in different media

• No, because light only behaves as a wave