You see a marble sign. Its letters are too worn to read. What caused this?
1 answer:
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The volume of a cube is given by:
where L is the measure of each side (which corresponds to its width, since all sides of a cube are equal).
Plugging the data of the problem, L=32.1 cm, inside the equation, we find the volume:
The speed of sound at 
is approximately v=343 m/s. The distance covered by the sound wave is
And the time it takes is
Now we want to find how far the light travels during this time. Light travels at speed
, therefore the distance it covers during this time is
And the time it takes is
Now we want to find how far the light travels during this time. Light travels at speed