Only genius answer challenge for them
Q. The star Sirius is about 8.1×10^13km from the Earth. Assuming that light travels at speed of 3.0×10^5 km per second, find how long light from Sirius takes to reach the Earth.( give answer in seconds)
Anonymous:
s = d/t.....................t=d/s
time = distance/speed now put the values..............
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Speed = distance / time
==> time = distance / speed
Given :
distance = 8.1 × 10¹³ km
speed = 3 × 10⁵ km/s
time = distance / speed
= 8.1 × 10¹³ km / 3 × 10⁵ km/s
= 2.7 × 10 ¹³⁻⁵
= 2.7 × 10⁸s
The time will be 2.7 × 10⁸s
Hope it helps
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how did 2.7 come
8.1 divided by 3 gives 2.7 :-)
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