# sonometer expirment f*l=constnat

Sunil Kumar FP
10 years ago

Sonometer is device used to measurethe frequency of tunning fork. A wire is stretched by appling tension at one end and fixing the other end to a screw that is provided. If ithe string is subjected to a distrubance it would vibrate with a certain frequency.

For sonometer experiment, the apparatus consist of a wooden box which is hallow and has holes on the sides for free vibrations of air inside. A thin wire of whose linear density is known is stretched over the bridges by means of hanging weights over a pulley with other end fixed. By changing the distance between the wooden bridges the length of the vibrating column can be changed. A small paper rider is placed on the string between the bridges. A standard tuning fork is struck with a rubber hammer and the stem of the fork is kept on the box. Now by moving the distance of the bridges, the length of the vibrating column can be adjusted until the frequency of vibrations of the string is equal to the frequency of tuning fork. At resonance (frequencies equal) the paper rider is thrown off the wire.

proof

Verification of law:

The tension in the wire is kept constant by keeping the weights that are hung over the pulley are unchanged. A tuning forkof known frequency is excited with rubber hammer and is placed on the sonometer. The bridges are adjusted until the paper rider is thrown off indicating the condition of resonance. The corresponding length between the bridges is noted. By changing the frequency of the tuning the experiment is repeated and the corresponding value of the length of the vibrating column is noted. If f is the frequency and L is the length of the vibrating column then

f1L1= f2L2= constant

thanks and regards
sunil kr
`Sonometer is device used to measurethe frequency of tunning fork. A wire is stretched by appling tensionat one end and fixing the other end to a screw that is provided. If ithestring is subjected to a distrubance it would vibrate with a certainfrequency.For sonometer experiment, theapparatus consist of a wooden box which is hallow and has holes on thesides for free vibrations of air inside. A thin wire of whose lineardensity is known is stretched over the bridges by means of hangingweights over a pulley with other end fixed. By changing the distancebetween the wooden bridges thelength of the vibrating column can be changed. A small paper rider isplaced on the string between the bridges. A standard tuning fork isstruck with a rubber hammer and the stem of the fork is kept on the box.Now by moving the distance of the bridges, the length of the vibratingcolumn can be adjusted until the frequency of vibrations of the stringis equal to the frequency of tuning fork. At resonance (frequenciesequal) the paper rider is thrown off the wire.proofVerification of law:The tension in the wire is kept constant by keeping the weights that are hung over the pulley are unchanged. A tuning forkof known frequency is excited with rubber hammer and is placed on thesonometer. The bridges are adjusted until the paper rider is thrown offindicating the condition of resonance. The corresponding length betweenthe bridges is noted. By changing the frequency of the tuning theexperiment is repeated and the corresponding value of the length of thevibrating column is noted. If f is the frequency and L is the length ofthe vibrating column thenf1L1= f2L2= constantThanks & RegardsRinkoo GuptaAskIITians Fcaulty`