the speed of light in glass about 2×10^8.Use the formula time= distance/speed to find the time (in hours) for a pulse of light to travel 7200 km in glass?
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Answer:
Step-by-step explanation:
Time=distance/speed
d=7200km=7.2×10^6m
S=2×10^8m/sec
T=7.2×10^6m/2×10^8m/sec
=3.6/10^2 sec
In hours,so 60(min)×60(sec)
=3.6/10^2×60×60
=6/10^2×60
=1/10×10×10
=1/10^3
=10^-3 hrs
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