Traffic signals are often now made of LEDs (lightemitting...

Traffic signals are often now made of LEDs (lightemitting diodes). Amber and green ones are pictured here. (a) The light from an amber signal has a wavelength of $595 \mathrm{nm},$ and that from a green signal has wavelength of 500 nm. Which has the higher frequency? (b) Calculate the frequency of amber light. (FIGURE CAN'T COPY)

Traffic signals are often now made of LEDs (lightemitting diodes). Amber and green ones are pictured here.
(a) The light from an amber signal has a wavelength of $595 \mathrm{nm},$ and that from a green signal has wavelength of 500 nm. Which has the higher frequency?
(b) Calculate the frequency of amber light.
(FIGURE CAN'T COPY)

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Key Concepts

Electromagnetic Wave Properties

Electromagnetic waves, which include visible light, are characterized by their wavelength and frequency. The relationship between these two quantities is described by the equation c = ?f, where c is the constant speed of light. This means that as the wavelength decreases, the frequency increases, and vice versa.

Speed of Light

The speed of light in a vacuum is a fundamental constant, approximately 3.00 x 10^8 meters per second. This constant is used in calculations to convert between the wavelength and frequency of light, highlighting the intrinsic link between these two characteristics of electromagnetic waves.

Frequency Calculation

Calculating the frequency of light involves rearranging the relationship between speed, wavelength, and frequency. By using the formula f = c/?, one can determine the frequency when the wavelength is known, providing a quantitative understanding of the light's properties within the electromagnetic spectrum.

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