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Wandering if you could help me :D lol

anyways,

**a loudspeaker vibrates at a frequency of 256 herts to produce a note we call middle c.**

(a) how many waves does it produce in one second

(b) how many waves does it produce in 1 minute.?

(a) how many waves does it produce in one second

(b) how many waves does it produce in 1 minute.?

and also ...

**when a stone is dropped into a pond the watr waves spread out and travel a distance of 4 meters in 2 seconds. what is the speed of these waves?**

i know they might be simple to you, but i havent been taught how to do these ...

I got taught how to find out freqency and period, but i just cant figure out how to do these

YOUR HELP WILL BE APPRECIATED :D

xo