The speed of a sound wave traveling through air is 400 meters per second. The wavelength of the wave is 25 meters. What is the frequency of the wave? A. 16 hertz
B. 10,000 hertz
C. 425 hertz
D. 0.0625 hertz

Oxygen and hydrogen gas are at the same temperature t.what is the ratio of kinetic energies of oxygen molecule and hydrogen molecule if oxygen is 16 times heavier than hydrogen.

Which system of units is used by only a small number of countries in the world, including the u.s.

An electron and a proton are held on an x axis, with the electron at x = + 1.000 m and the proton at x = - 1.000 m. part a how much work is required to bring an additional electron from infinity to the origin? express your answer with the appropriate units. part b if, instead of the second electron coming in from infinity, it is initially at x = + 20.00 m on the axis and is given an initial velocity of 100.0 m/s toward the origin, does it reach the origin? part c how close to the origin does it come?