Constants g = 9

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Constants g = 9.8 N/kg, G = 6.67 x 10 ^- 11 Nm^2 /kg^2 , c = 3.00 x 10^8 m/s, k = 8.99 x 10^9 Nm^2 /C^2 , e = 1.60 x 10 ^- 19 C, m electron = 9.11 x 10^ - 31 kg, m proton = 1.67 x 10 ^- 27 kg, m Earth = 5.98 x 10^24 kg, r Earth = 6.38 x 10^6 m, 

1.A beam from a krypton ion laser (???? = 461.9????????) falls on a single slit, producing a central maximum 4.0cm wide on a screen 1.50m away.

a. Calculate the slit width

b. Determine the angle between the rays travelling to the 2nd minima and the rays travelling to the central maxima.