A friend tells you a way to estimate how far away a lightning bolt strikes you count the numbers of seconds between seeing the flash and hearing the thunderclap then you divide that number by five to get a distance in miles in terms of the physics of light and sound waves does the method make sense

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.

Use the illustration to describe how the electromagnetic spectrum changes as its frequency moves from radio waves to higher energy gamma waves in terms of wavelength and amplitude.

Which is a substance that can be separated by physical means and is not the same throughout