Question

how do the frequencies and the speeds of yellow and blue light compare? (1 point)
the frequency of blue light is greater than that of yellow light, while the speeds of both colors of
light are the same.
the frequency of yellow light is greater than that of blue light, while the speed of blue light is faster
than that of yellow light.
the frequency of yellow light is greater than that of blue light, while the speeds of both colors of
light are the same.
the frequency of blue light is greater than that of yellow light, while the speed of yellow light is
faster than that of blue light.

Explanation:

1. Recall the properties of light: In a vacuum (or same medium), all electromagnetic waves (including visible light) travel at the same speed (speed of light, \( c \)).
2. Recall the relationship between frequency (\( f \)), wavelength (\( \lambda \)), and speed (\( c \)): \( c = f\lambda \). Blue light has a shorter wavelength than yellow light. Since \( c \) is constant, a shorter wavelength means a higher frequency (as \( f=\frac{c}{\lambda} \)).
3. Compare the options:

• Option 1: States blue light has higher frequency (correct, as shorter wavelength) and same speed (correct, same medium).
• Option 2: Incorrect about frequency (yellow has longer wavelength, lower frequency) and speed (same speed).
• Option 3: Incorrect about frequency (yellow has lower frequency).
• Option 4: Incorrect about speed (same speed).

Answer:

The frequency of blue light is greater than that of yellow light, while the speeds of both colors of light are the same.