Answer:
-20.158ft-lb
Explanation:
Check the attached files for the explanation.
Answer:
to have an accurate measure
Explanation:
0.75 kilometer= 75000 centimeters
Answer:
The wavelength of the light is 562.5 nm
Solution:
As per the question:
Order, n = 1
Slit separation, d = 
Distance from the bright fringe, y = 0.18 m
Distance between the screen and the grating, D = 0.8 m
Now,
We know from the eqn for diffraction:

n = 1
(1)
Also,
For very small angle,
:
≈ 
Using the above value in eqn (1):

I mean it’s alaska so i’m assuming B but i could be very wrong