Question

1. Color is produced by light that reflects from a soap film because some of the reflected light is

a. converted to a different frequency

b. deflected by interference

c. absent due to interference

d. amplified due to constructive interference

Reason/justification for answer

2. If a portion of a soap bubble in sunlight appears yellow, then the light cancelled by interference had the color

a. red

b. yellow

c. blue

d. green

Reasons/justification of answer

3. Light is emitted by vibrating

a. electric fields

b. magnetic fields

c. electrons

d. rhythms

Reasons/justification for answer

Answer 1

1) Color is produced by light that reflects from a soap film because some of the reflected light is amplified due to constructive interference.

This is due to the light reflected from different surfaces of the soap bubble. The light reflected from the bottom and the top surface has a path difference, which results in interference of them.

2) If a portion of a soap bubble in sunlight appears yellow, then the light cancelled by interference had the color blue.

The three primary colours in while light are red, green and blue.

White =red +green +blue

Yellow = red+ green

So White - Yellow= Blue

3) Light is emitted by vibrating electron. Vibrating electron changes the electric and magnetic field around it and produces an electromagnetic wave. Since light is an electromagnetic wave, light is also produced by the vibration of electrons.