Answer:

Explanation:
From the given information, the LED is operating with a given wavelength of 850 nm or 0.85 μm.
Hence, the material dispersion is 
Now, using the pulse spread formula:


Thus, the pulse spreading as a result of material dispersion is:
The answer is actually a,b, and d
Brainliest?
Answer:
(D) It is stronger when the objects are closer.
Explanation:
Newton's universal law 9f gravitation
Answer:
charge will be equal to
Explanation:
We have given mass of the particle m = 1.45 gram = 0.00145 kg
Acceleration due to gravity 
Electric field E = 700 N/C
Electric force will be equal to
, here q is charge and E is electric field
For particle to be stationary this force must be equal to force due to gravity , that is mg force
So qE = mg

So charge will be equal to
The movement of air flows from high pressure to low pressure