Q4 - Physical Sci #3 - Light Phenomenon

Rain clouds are mostly gray because:

• it mostly absorbs all colors except gray

• it reflects less light as it prepares to rain

• it reflects more light due to larger water molecules

• it does not scatter light and focuses it on the atmosphere

Which of the following is true about rainbows?

i. Secondary rainbows occur in the order ROYGBIV.

ii. Purple can be seen in primary rainbows.

a. b. c. d.

• i only

• ii only

• both i and ii

• neither i and ii

Blue skies occur during the day due to:

• Diffraction

• Mie scattering

• Rayleigh scattering

• Tyndall Effect

The following correctly explains light passing through a cellophane except:

• As white light passes through red cellophane, the cellophane absorbs all colors except red.

• Green light can’t easily pass through green cellophane because it shows the same color.

• A red light passing through red cellophane will simply go through since they have the same color.

• Red light can’t easily pass through green cellophane since the cellophane absorbs the red light.

The following describes a mirage as a light phenomenon except:

• Mirages form a circular arc around the anti-solar point, which is located at the shadow of your head.

• An optical phenomenon that results from the refraction of light through a non-uniform medium is called a mirage.

• If a driver looks down at the roadway at a very low angle, light from objects above the roadway will follow a curved path causing a mirage.

• A mirage makes it seem there is a puddle of water on the road that is causing you to see objects located above the road.

Which of the following shows the correct sequence of rainbowformation?

• Refract – Reflect – Refract

• Refract – Refract – Reflect

• Reflect – Reflect – Refract

• Reflect – Refract – Refract

What principle is responsible when we see yellow to red skies in the early morning or late afternoon?

• Diffraction

• Dispersion

• Interference

• Scattering

For a source like the sun, rays spread out in all directions; the wave fronts are spheres centered on the sun. If the source is of great distance away, the wave fronts can be treated as

• wavy lines

• parallel lines

This is a proof that light travels in a linear path

• shadow

• sunrise

• blue sky

• rainbow

Shadows appear totally dark because of some light that reaches the surface that has been reflected off other objects.

• True

• False