Question

Two in-phase sources of waves are separated by a distance of 4.00m. these sources produce identical waves that have a wavelength of 5.00m. On the line between them, there are two places at which the same type of interference occurs.

32)  Which type of interference occurs twice?

constructive

destructive

neither

Young's double slit experiment is set up to measure an unknown frequency of light. The distance between the slits is .30 mm and the screen with the interference pattern is 4.2 m away. The distance between the central bright fringe and the next bright fringe is 6 mm.

33)  If lower frequency light was used, what would happen to the spacing of the bright fringes?

nothing

they would spread apart

they would get closer together

34)  If the entire apparatus was placed underwater, what would happen to the spacing of the bright fringes?

nothing

they would spread apart

they would get closer together

Answer 1

Required two locations between two sources A&B (32) .4m S24- P 4-X path difference dah, - 4-*-* 4-22 Condition for constructive d2-8; ama Form=1 4-2x = m(s) 4-2x = 115) 2-2x=5 For m=0 4-2x = 0 2X=1 Y not possible 2x=4 x=2m 2, 22, 2₂=2 ma only me location no 4-2x =:-5 2x=9 ) X= 4.5 outlide y no m=0 Condition for Destructive P2-2.- (m+²) a 4-2x = 3 (5)-2.5 2x = 4-2.5=15 LS = 0.75m So Destructive ...h = 0.78m a = 4-0.75 = 3.25 m ㅈ Both locations in b/w the two sources.