A sonar signal leaves a submarine, travels through the water to another submarine and reflects back to
the original submarine in 4.00 s. If the frequency of
the signal is 512 cycles per second and the
wavelength of the signal is 2.93 m. How far away is
the second submarine?

Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.

Will a heavier bowling ball hit pins better than a lighter bsll

Abird sitting high in a tree is an example of what type of wnergy