Find out the relation between fundamental frequencies of a closed and an open pipe?

Find out the fundamental frequency of a 125 cm long organ pipe closed at one end . Given, velocity of sound in air = 350 m*s^(-1) .

What is the relation between time period and frequency?

show that the fundamental frequency of an open pipe is double the fundamental frequency of a closed pipe of the same length .

One mouth of an open pipe is suddenly closed. If is found that the frequency of the third harmonic of the closed pipe is greater by 100 Hz than the frequency of the fundamental of the open pipe. Calculate the funda-mental frequancy of the open pipe.

If the fundamental frequency of a closed pipe is 200 Hz . What would be the fundamental frequency of an open pipe of equal length ?

The length of an open organ pipe is twice the length of another closed organ pipe. The fundamental frequency of the open pipe is 100 Hz . The frequency of the thrid harmonic of the closed pipe is