Electronic signals are converted into a 'ray of light' -
Answer:
All are not true.
Explanation:
Sound needs medium to travel.
sound speed is fastest in solids.
Answer:
the weight of astronauts on earth is greater than his weight on d moon
Explanation:
due to the greater gravitational pull in earth the weight seems to me more
but for the moon where there is less gravity
its weight will be less causing slight flotation
