A sound wave has a frequency of 400Hz and a wavelength of 20 meters, what is the speed?

What is a shocking irony about the villagers in the lottery

Select all that apply. in 1830, the french king charles x

Why was galileo galilei brought before the inquisition? for insisting that earth stands still at the center of the universe for proving that planets move in elliptical orbits for putting forth evidence that earth moves around the sun for suggesting that the sun is a star