MYP Physics Color and Light Practice Quiz Answers

1. The range of wavelengths for the visible spectrum of light is between 400nm and 700 nm.

2. The speed of light is 3.0 x 108 m/s.

3. What is a light year? The distance light traveled in a year.

4. Electromagnetic waves with frequencies lower than red are called Infrared.

5. Explain the difference between opaque and transparent objects 5. Explain the difference between opaque and transparent objects. Materials that absorb light without reemission and thus allow no light through them are opaque. Light passes through materials whose atoms absorb the energy and immediately reemit it as light. Materials that transmit light are transparent. Glass and water are transparent.

The dark part of a shadow is called the umbra.

7. Explain how a solar eclipse is formed 7. Explain how a solar eclipse is formed. The moon passes between the Sun and the Earth.

8. What did Newton do to discover the different color of light and what did he call it? He shined a light beam through a prism and saw the rainbow and called it a spectrum.

9. Explain why objects are black 9. Explain why objects are black? Black is not a color, but is the absence of light. Objects appear black when they absorb light of all visible frequencies

10. Why is the sky blue? Because of Rayleigh Scattering, the shortest wavelength of the visible light spectrum, blue, scatters the most in the upper atmosphere.

11. Explain the difference between colors by reflection and colors by transmission. The color of an opaque object is the color of the light it reflects. The color of a transparent object is the color of the light it transmits.

12. The color that is the brightest in the color spectrum is yellow – green.

13. The colors red, blue, and green are known as additive primary color.

14. Knowing that the Planck’s constant is 6. 63 x 10-34 Js 14. Knowing that the Planck’s constant is 6.63 x 10-34 Js. Determine the amount of energy for a photon with a frequency of 6.8 x 1015 Hz. E = hf E = (6.63 x 10-34)(6.8 x 1015) E = 4.51 x 10-18 Joules

15. What is the wavelength of electromagnetic radiation have a frequency of 5.00 x 1012 Hz? v = lf 3.0 x 108 = l(5.00 x 1012) l = 6 x 10-5

16. Which region of the electromagnetic spectrum has the longest wavelength? Radio Waves

17. Which two regions of the spectrum have the greatest ability to diffract? Radio and Microwave

18. Which color of the visible light spectrum has the highest frequency? Violet

19. As light passes through transparent objects, the speed at which it travels is Slows down

20. Red light is the complementary color to what Cyan

21. Using the color spectrum of light, give the following addition/subtraction colors. a. Red + Cyan = White b. (correction) Cyan – Blue = Green c. Green + Red = Yellow d. Green + Red + Blue = White e. White – Red = Cyan f. White – Yellow = Blue