Yellow light has a frequency of 5.2 × 1014 Hz and travels at a speed of 3.0 × 108 m/s. What is the wavelength of yellow light, in meters?

5.8 × 10–7 m
2.2 × 10–6 m
1.7 × 106 m
8.2 × 1022 m

1 answer

To find the wavelength of yellow light, we can use the formula that relates the speed of light (c), frequency (f), and wavelength (λ):

\[ c = f \times \lambda \]

Rearranging this formula to solve for the wavelength gives us:

\[ \lambda = \frac{c}{f} \]

Given:

  • Speed of light, \(c = 3.0 \times 10^8 \text{ m/s}\)
  • Frequency, \(f = 5.2 \times 10^{14} \text{ Hz}\)

Now, we can substitute the values into the equation:

\[ \lambda = \frac{3.0 \times 10^8 \text{ m/s}}{5.2 \times 10^{14} \text{ Hz}} \]

Calculating this gives us:

\[ \lambda = \frac{3.0}{5.2} \times \frac{10^8}{10^{14}} \text{ m} \]

Calculating the numerical part:

\[ \frac{3.0}{5.2} \approx 0.5769 \]

Now for the powers of ten:

\[ \frac{10^8}{10^{14}} = 10^{-6} \]

Now putting it all together:

\[ \lambda \approx 0.5769 \times 10^{-6} \text{ m} \]

Converting this to scientific notation:

\[ \lambda \approx 5.769 \times 10^{-7} \text{ m} \]

Rounding this to two significant figures gives:

\[ \lambda \approx 5.8 \times 10^{-7} \text{ m} \]

Thus, the wavelength of yellow light is \( \mathbf{5.8 \times 10^{-7} \text{ m}} \).

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