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4 years ago

A unit for measuring frequency is the A. watt. B. hertz. C. ampere. D. ohm.

Physics

1 answer:

Strike441 [17]4 years ago

4 0

The dimension of frequency is reciprocal time.
The unit is the Hertz.
1 Hertz = 1 per second.

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The speed of electron is $1.5\times10^{7}\ m/s$

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$v=1.21\times10^{7}\ m/s$

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Using given potential energy

$\Delta U=-9.60\times10^{-17}-(-5.04\times10^{-17})$

$\Delta U=-4.56\times10^{-17}\ J$

We need to calculate the speed of electron

Using change in energy

$\Delta U=-W=-\Delta K.E$

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$\dfrac{1}{2}m(v_{f}^2-v_{i}^2)=4.56\times10^{-17}$

Put the value into the formula

$v_{f}=\sqrt{\dfrac{2\times4.56\times10^{-17}}{9.1\times10^{-31}}+(1.21\times10^{7})^2}$

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