A sonometer is an audiometer. A measuring instrument used to measure the sensitivity of hearing.
sonometer
The sonometer wire is usually made up any material which is non-magnetic in nature.
Here's a tip: You don't even need a sonometer. The frequncy of DC is zero.
A sonometer is an apparatus for investigating the vibration of a string or wire under tension. The equipment allows the length of the string and its tension to be varied. See Wikipedia entry 'sonometer' for more details
resonance
The holes in a sonometer will make sure the inside air in communication with outer air therefore we can hear the sound.
resonanace...
stationary transverse waves
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to produce uniform magnetic field
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