Explanation:
Given that,
Wavelength of light, 
Angle, 
We need to find the slit spacing for diffraction. For a diffraction, the first order principal maximum is given by :

n is 1 here
d is slit spacing

So, the slit spacing is
.
Answer:4s^-1
Explanation:Tangential Acceleration=v^2/r=(20)²/100=400/100
C it reduces the amount of useful work done on objects move it up the ramp
its D
i hope this helps to future test takers. i took the test and had to retake it because their wasn't an answer