A cathode ray oscilloscope(CRO) is a device which converts electrical signals into an active graphical representation on a fluorescent screen. The x axis is always time axis, where the $1$ cm is equal to a preset time scale called time base. A sound wave is displayed on the screen of a cathode ray oscilloscope. The time base of the CRO is set at $2.5 m s / c m$ . What is the frequency of the sound wave?

50 H z

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100 H z

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200 H z

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400 H z

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Solution

The correct option is B $100 H z$
As the signal covers 4 divisions at 2.5 millisecond/cm, therefore signal period will be:
$T = 4 \times 2.5 = 10 m s = 0.01 s$
therefore, frequency,
$f = 1 / T = 1 / 0.01 = 100 H z$

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The correct option is B 100HzAs the signal covers 4 divisions at 2.5 millisecond/cm, therefore signal period will be: T=4 × 2.5=10ms=0.01 s therefore, frequency, f=1/T=1/0.01=100 Hz

The correct option is B $100 H z$
As the signal covers 4 divisions at 2.5 millisecond/cm, therefore signal period will be:
$T = 4 \times 2.5 = 10 m s = 0.01 s$
therefore, frequency,
$f = 1 / T = 1 / 0.01 = 100 H z$