D is the correct answer!!
The answer will be 50N.
This is because the spring reads weight and weight is mass times acceleration due to gravity.5kg*10m/s2=50N
Λ
![= 550 * 10^{-9}\] m. D = 3.50*10^-6 m.](https://tex.z-dn.net/?f=%20%3D%20550%20%2A%2010%5E%7B-9%7D%5C%5D%20m.%0A%0AD%20%3D%203.50%2A10%5E-6%20m.)

Then you need to find x when n=1
or

≈θ for θ<<1 , so θ=

Then you can find rhe distance of<span> bright fringe from the center:</span>
Cathode ray tube, plumb pudding model, atoms were not hard spheres, but had smaller parts.