15 pts wants to calculate the speed at which a sound wave is traveling. she knows that the frequency of the wave is 680 hertz and that the wave has a wavelength of 0.5 meters.
what is the speed of the sound wave?
in m/s

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

How are the terms group and period used on the periodic table

What role does weathering have in shaping earth’s surface? a) it allows sediments to fall out of a medium. b) it sediments settle on a new surface. c) it breaks down older material into sediments. d) it transports sediments to a different location. will give brainliest, answer quickly.