Question

We never learned this!!! I'll give a medal to whoever can help me!!!
I've read and re-read my lessons like 7 times it's not there!

The paths of the light waves that interfere to cause first-order lines

A. differ in length by the wavelength of the light.

B. are parallel lines.

C. are the same length.

D. differ in length by one-half of the wavelength of the light.

Answer 1

@Mashy Help Me!!! *Insert Anime crying* ='(

Answer 2

well anyone works but still

Answer 3

you need to know what causes those bright and dark fringes in interference.. can you tell me why you get interference in the first place?

Answer 4

the interference occurs when waves either cancel each other out or reinforce each other

Answer 5

and when do they reinforce each other? i mean what condition?

Answer 6

Two coherent waves traveling along two different paths to the same point will interfere destructively if there is a difference in distance traveled that is equivalent to a half number of wavelengths. And two coherent waves traveling along two different paths to the same point will interfere constructively if there is a difference in distance traveled that is equivalent to a whole number of wavelengths.

Answer 7

I that out of this site:
http://www.physicsclassroom.com/Class/light/U12l3e.cfm
(My lessons aren't that specific)

Answer 8

there you go.. so now try to answer the questoin :P

Answer 9

So it would be A

Answer 10

what about C/?? why can't C be the answer?

Answer 11

oh yeah. oops

Answer 12

no .. answer me.. think !!

Answer 13

A little pushy aren't we? Okay. Fine. It COULD be C but if they were the same length then they would most likely cancel each other out. (I've learned for several years in a row that usually when something(s) are the same in measurement they tend to cancel each other out.)

Answer 14

So I still wanna stick with A even though I'm still considering C as a small possibility

Answer 15

Are you still there @Mashy ?

Answer 16

A. differ in length by the wavelength of the light.