Waves Test - 11...

The frequency of the fundamental note in a wire stretched under tension T is v. If the tension is increased to 25 T. then the frequency of the fundamental note will be

The frequency of fundamental note in an organ pipe is 240 Hz. On blowing air, frequencies 720 Hz and 1200 Hz are heard. This indicates that organ pipe is

In the experiment to determine the speed of sound using a resonance column

A metal wire of linear mass density of 9.8 gm^-1 is stretched with a tension of 10 kg-wt between two rigid supports 1 m apart. The wire passes at its middle point between the poles of a permanent magnet and it vibrates in resonance when carrying an alternating current of frequency v. The frequency v of the alternating sources is

An open organ pipe of length l vibrates in its fundamental mode. The pressure variation is maximum

A closed organ pipe and an open organ pipe are tuned to the same fundamental frequency. The ratio of their lengths is

A string is stretched between fixed points separated by 75 cm. It is observed to have resonant frequency of 420 Hz and 315 Hz. There are no other resonant frequencies between these two. Then, the lowest resonant frequency for this string is

A note has a frequency 128 Hz. The frequency of a note two octaves higher than it is

Two vibrating strings of the same material but lengths L and 2L have radii 2r and r respectively. They are stretched under the same tension. Both the strings vibrate in their fundamental modes, the one of length L with frequency v₂. The ratio v₁ /v₂ is