An organ pipe open at one end, but closed at the other, is vibrating in its fundamental mode, producing sound of frequency 1800 hz. part a if you now open the closed end, the new fundamental frequency will be if you now open the closed end, the new fundamental frequency will be

a. 3600 hz
b. 1800 hz
c. 900 hz
d. 450 hz

The new fundamental frequency will be 3600 Hz.

Explanation:

On a closed organ pipe, the fundamental frequency is given by :

.............(1)

l is the length of the pipe

v is the speed of sound

Similarly, on an open pipe the fundamental frequency is given by :

From equation (1),

So, the new fundamental frequency will be 3600 Hz. Hence, this is the required solution.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me