Question

Suppose Galileo and his assistant were 1 km apart when Galileo uncovered his lantern to try to measure the speed of light. How long would it have taken the light signal to reach his assistant?


A. 3.0 * 10^8 s

B. 3.3 * 10^-9 s

C. 1.0 s

D. 3.3 * 10^-6 s

Answer 1

it is simple, since we have to apply this formula:
\[t = \frac{d}{c} = \frac{{10 \times 3}}{{3 \times {{10}^8}}}\]

Answer 2

oops..I have made a typo, here is the right formula:

Answer 3

ok!

Answer 4

\[t = \frac{d}{c} = \frac{{{{10}^3}}}{{3 \times {{10}^8}}}\]

Answer 5

we get 3.333333333E-6?

Answer 6

yes!

Answer 7

so our solution is choice D?

Answer 8

yes!

Answer 9

yay!! :) Thanks!!

Answer 10

:)