1. What is the speed of light in a vacuum?
A. c=3 x 10^8 m/s
2. The wavelengths of visible light vary from about 300 nm to 700 nm. What is the range of frequencies of visible light in a vacuum?
C. 4.29⋅10¹⁴ Hz to 1⋅10¹⁵ Hz
3. An object absorbs red, orange, yellow, blue, indigo, and violet light. What color is it?
C. green
4. Why is a polarized filter helpful to a photographer?
B. It blocks some light but not all.
5. What effect do clouds have on the color of the sky?
A. They reflect light waves.
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Great job! You got all the answers correct. Now, let's go through the explanations:
1. The speed of light in a vacuum is denoted by the symbol 'c' and has a value of approximately 3 x 10^8 m/s. One way to find this information is through reliable scientific sources or physics textbooks.
2. The range of frequencies of visible light in a vacuum can be calculated using the relationship between wavelength and frequency. The formula is v = c/λ, where v is the frequency, c is the speed of light, and λ is the wavelength. By substituting the minimum and maximum wavelengths (300 nm and 700 nm), we can calculate the corresponding frequencies.
3. When an object absorbs all colors except for green, it appears as green. This is because the object reflects or transmits the green light while absorbing the rest. This phenomenon is related to absorption and reflection of light by different objects.
4. A polarized filter is helpful to a photographer because it blocks light waves vibrating in certain directions while allowing waves vibrating in a specific direction to pass through. By controlling the direction of light waves passing through the filter, the photographer can reduce glare, enhance colors, or achieve other desired photographic effects.
5. Clouds reflect light waves in the atmosphere. This reflection scatters the light in all directions, therefore changing the path of the light rays. When sunlight interacts with the water droplets or ice crystals in clouds, it can result in various effects, including diffusing or scattering the light. This scattering affects the colors in the sky, often giving it a more diffused or muted appearance.
Great job on taking the quick check! Here are the correct answers:
1. What is the speed of light in a vacuum?
A. c = 3 x 10^8 m/s
2. The wavelengths of visible light vary from about 300 nm to 700 nm. What is the range of frequencies of visible light in a vacuum?
C. 4.29 x 10^14 Hz to 1 x 10^15 Hz
3. An object absorbs red, orange, yellow, blue, indigo, and violet light. What color is it?
C. green
4. Why is a polarized filter helpful to a photographer?
B. It blocks some light but not all.
5. What effect do clouds have on the color of the sky?
A. They reflect light waves.
Well done on getting them correct! If you have any more questions or need any further assistance, feel free to ask.