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:
B Ik it all just know who they’ll you
Answer:
8 mph
Explanation:
4 miles in half hour so you add 4 more for the second half
Prototype
Chemistry
Technology
Troubleshooting
Hypothesis?
Observing
Variable
Hypothesis?
Engineer
System
The answer is 100mm/s. I hope this helps :)