Question

Which statement describes an example of constructive interference?

A. Two TV signals reach an antenna and cancel each other out.
B. Light forms bars on a surface after passing through two slits.
C. Oil spilled in a water puddle shows different colors of light.
D. A cell-phone signal is lost when you pass through a certain area.

Answer 1

Constructive interference occurs when two waves combine to produce a wave with a larger amplitude. An example is when light passes through two slits and forms bars on a surface.

Step-by-step explanation:

Constructive interference occurs when two waves combine to produce a resulting wave with a larger amplitude. An example of constructive interference is when light passes through two slits and forms bars on a surface, creating an interference pattern. This occurs because the waves from each slit overlap and reinforce each other, leading to areas of constructive interference where the wave amplitudes add up.

Answer 2

b

Step-by-step explanation:

because Constructive interference occurs when the maxima of two waves add together (the two waves are in phase), so that the amplitude of the resulting wave is equal to the sum of the individual amplitudes. Equivalently, the minima of the waves would be aligned.