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Chapter 5: Problem 12

T/F: Blue light has more energy than red light.

Short Answer

Expert verified
True. Blue light has more energy than red light.

Step by step solution

01

- Understand the relationship between light and energy

Energy of light is directly related to its frequency. Higher frequency means higher energy.
02

- Know the spectrum of visible light

Visible light ranges from red to violet. Red light has the lowest frequency and violet has the highest.
03

- Compare the frequencies

Blue light is closer to violet, meaning it has a higher frequency than red light.
04

- Conclude the energy comparison

Since blue light has a higher frequency than red light, it also has more energy.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Visible Light Spectrum
The visible light spectrum is a small portion of the electromagnetic spectrum that is visible to the human eye. It ranges from red light with longer wavelengths (approx. 700 nm) to violet light with shorter wavelengths (approx. 400 nm).
The sequence of colors in the visible spectrum follows this order: Red, Orange, Yellow, Green, Blue, Indigo, and Violet (remember ROYGBIV).
These colors correspond to different wavelengths and frequencies. Red light has the longest wavelength and the lowest frequency, while violet light has the shortest wavelength and the highest frequency. Understanding this spectrum helps us compare the energy levels of different light colors.
Light Frequency
Frequency refers to the number of waves that pass a point in one second, measured in Hertz (Hz). Higher frequency means more waves pass by in a given time.
In the context of visible light, violet has the highest frequency, followed by indigo, blue, green, yellow, orange, and red.
Because red light has the lowest frequency and violet light the highest, these characteristics affect the energy associated with each color.
For instance, blue light has a higher frequency than red light but a lower frequency than violet light.
Energy of Light
The energy of light is directly proportional to its frequency; this relationship is given by the equation:
\( E = h \cdot f \)
where E is the energy, h is Planck's constant (≈ 6.626 x 10^-34 Js), and f is the frequency.
From the visible light spectrum, since blue light has a higher frequency than red light, it naturally possesses more energy.
Understanding this relationship helps elucidate why blue light (which is closer to violet) carries more energy compared to red light.

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Most popular questions from this chapter

Suppose you have two monochromatic light beams. Beam has half the wavelength of beam \(2 .\) How do their frequencies compare? a. Beam 1 has 4 times the frequency of beam 2. b. Beam 1 has 2 times the frequency of beam 2. c. They are the same. d. Beam 1 has \(1 / 2\) the frequency of beam 2 e. Beam 1 has \(1 / 4\) the frequency of beam 2

Two stars appear to have the same brightness, but one star is 3 times more distant than the other. How much more luminous is the more distant star?

Rank the following in order of decreasing wavelength. a. gamma rays d. ultraviolet light b. visible light e. radio waves c. infrared light

Light acts like a. a wave. c. both a wave and a particle. b. a particle. d. neither a wave nor a particle.

A favorite object for amateur astronomers is the double star Albireo, with one of its components a golden yellow and the other a bright blue. What do these colors tell you about the relative temperatures of the two stars?
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