Help please:
A dog whistle emits frequencies above the range of human hearing, but within the range that dogs can hear. If a dog whistle is modeled as a tube open at both ends, how long would the whistle need to be if the fundamental frequency of the whistle is at the upper limit of human hearing, assumed to be 20,000 Hz? (Take the speed of sound in air to be 343 m/s.)
Thank you!

Question

Help please:
A dog whistle emits frequencies above the range of human hearing, but within the range that dogs can hear. If a dog whistle is modeled as a tube open at both ends, how long would the whistle need to be if the fundamental frequency of the whistle is at the upper limit of human hearing, assumed to be 20,000 Hz? (Take the speed of sound in air to be 343 m/s.) 
Thank you!

anonymous · Answer

It's a physics problem and I wouldn't even know where to begin.

anonymous · Answer

nvm i found the answer