Answer / rajesh.y

350hz and 440hz held steady by -13dbmo/frequency

Answer / kingston

50HZ

Answer / anil yogi

350 and 440 Hz

Answer / noddy

350 MHz and 440MHz

Answer / ravikant

In teliphone there is a fixed frequency of each column &
row. When we press any key in teliphone,according to
supperposition law a wave of different frequency is generated.
this is called dialer tone frequency.
In teliphone each no having different frequency.

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