Two slits separated by 2.00 X 10(5 m are illuminated by light of wavelength 500nm. If the screen is 8.0 m from the slits, what is the distance between the m = 1 and m = 3 dark fringes?

40 cm

Explanation:

To find the distance between the third and first dark fringe you use the following formula:

y: height of the dark fringe respect to the central peak

λ: wavelength of light

D: distance to the screen

d: distance between slits

Nexy, you calculate for m=3 and m= 1

Finally, you calculate the difference y3 - y1:

y3 - y1 = 0.7m - 0.3m = 0.4m = 40 cm

hence, the distance between the third ans first dark fringe is 40 cm

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it