Answer:
I am not quite sure, but maybe you can find something from these websites
The second one to me is the best. Sorry if it wasn't what you needed. :(
Explanation:
https://phys.org/news/2012-11-metamaterial-lens-focuses-radio-device.html
https://animals.howstuffworks.com/fish/sharks/shark-yummy-hum1.htm
Answer:
300 meters per second. That's equal to about 670 miles per hour.
Explanation:
Not only are air particles incredibly small, they are always moving. And they move fast. At room temperature, they are going about 300 meters per second. That's equal to about 670 miles per hour.
At a definite point, the bridge would begin oscillating to the matching rhythm as that
of the marching footsteps.
This oscillation would touch a determined peak when the bridge can
no longer tolerate its own
power and later collapses. So, soldiers are
systematic to break their steps
while passing a bridge.
