Green light of a certain wavelength is incident upon two valors separated by 2.10 x 10^-5 m. A screen is placed .800m from the slits. The distance from the central bright line to the first-order line is 19.9 mm. What's the wavelength of the light ?

for bright fringe on a young double slit u would use the formula

Y = ( m× wavelength × distance from the screen ) / ( distance btn the slits )

Explanation:

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.