A Level Physics Practice Exam

Question: 1 / 400

What is the number of complete waves emitted from a source with a wavelength of 600 nm in 0.01 μs?

1 * 10^6

5 * 10^6

To find the number of complete waves emitted from a source, we start with understanding the relationship between the speed of a wave, its frequency, and its wavelength. The formula to use here is:

\[ v = f \cdot \lambda \]

where \( v \) is the speed of the wave (for light in a vacuum, approximately \( 3 \times 10^8 \) m/s), \( f \) is the frequency, and \( \lambda \) is the wavelength.

Given a wavelength of 600 nm (which is equivalent to \( 600 \times 10^{-9} \) m), we can first calculate the frequency of the wave:

\[ f = \frac{v}{\lambda} = \frac{3 \times 10^8 \, \text{m/s}}{600 \times 10^{-9} \, \text{m}} \]

Calculating this gives:

\[ f = \frac{3 \times 10^8}{600 \times 10^{-9}} = \frac{3 \times 10^8}{6 \times 10^{-7}} = 5 \times 10^{14} \, \text{Hz} \

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2 * 10^14

3 * 10^14

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