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Q10PE

Expert-verifiedFound in: Page 888

Book edition
1st Edition

Author(s)
Paul Peter Urone

Pages
1272 pages

ISBN
9781938168000

**Combing your hair leads to excess electrons on the comb. How fast would you have to move the comb up and down to produce red light?**

The frequency to move the comb up and down to produce red light is \(5 \times {10^{14}}\;Hz\).

**Frequency is the number of waves that pass through a specific spot in a specific length of time. **

The wavelength of red light: \({\lambda _{red{\rm{ }}}} = 600\;nm = 0.6 \times {10^{ - 6}}\;m\)

The speed of light value is: \(c = 3 \times {10^8}\;m/s\)

For an electromagnetic wave, the relationship between propagation speed, wavelength, and frequency is given by,

\(c = f\lambda \)

Consider the given formula and simplify,

** **

We have

\(\begin{aligned} c &= f\lambda \\3 \times {10^8} &= f \times 0.6 \times {10^{ - 6}}\\f &= 5 \times {10^{14}}\;Hz\end{aligned}\)

Therefore, frequency is \(5 \times {10^{14}}\;Hz\).

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