Asound wave has a frequency of 247 hz and a wavelength of 1.4 m. what is the speed of the sound wave in air?

What is the single most important equation in all of physics?

Ahot-air balloon is 11.0 m above the ground and rising at a speed of 7.00 m/s. a ball is thrown horizontally from the balloon basket at a speed of 9.00 m/s. ignore friction and air resistance and find the speed of the ball when it strikes the ground.

Atoms containing radioactive nuclei are called