Project #7134 - PHYSICS

1. Fill in the blanks in the following color combinations:

Yellow + blue = _______.
Green + _______ = white.
Magenta + yellow +cyan = _______.
Green + blue = white - _______.

2. Which has the greatest energy– a photon of infrared light, of visible light, or of ultraviolet light? Why?

1. Light “pipes” are used in communications to transmit telephone and data signals between various locations. What makes the light stay within the pipe?

1. Define dispersion, interference, and total internal reflection. Which of these phenomena is used in optical fibers? How is light propagation affected by the index of refraction of the medium?

1. Describe the operation of a typical spectrometer. What are the main parts of a spectrometer? Give an example of where spectrometers are used.

1. The following diagram shows a beam of light propagating from point A to point B through four optical elements. What optical elements are inserted in locations 1, 2, 3, and 4? Explain. (Note: lighter colors indicate lower light intensity).

1. Which requires a physical medium in which to travel – light, sound, or both? Explain. Do radio waves travel at the speed of light, at the speed of sound, or something in between?

1. The wavelength of light changes as light goes from one medium to another, while the frequency remains the same. Is the wavelength longer or shorter in water than in air? Explain in terms of the equation speed = frequency x wavelength. A certain green light has a wavelength of 600 nm (6 x 10-7 m) in air. What is its wavelength in water, where light travels at 75% of its speed in air?

1. Besides light sources and detectors, what are the main optical elements used in a typical optics experiment or an optical device? Explain their role.

1. Light bends when it passes obliquely from one medium to another, taking somewhat a longer path form one point to another. What does this longer path have to do with the time of travel of light? Discuss the differences between reflection and refraction.

1. How do excitation and emission take place in atoms? What is an absorption spectrum? What can you use it for? Does it require a single wavelength light or a continuous spectrum? What is the function of a spectrometer?

2. Explain total internal reflection and discuss its application(s).
3. A beam of light is incident from a material with a lower index of refraction into one with a higher index of refraction. (a) Is the beam bent toward the normal to the surface or away from it? Same question in the case where the beam is incident from a material with a higher index of refraction into one with a lower index of refraction.

 Subject Science Due By (Pacific Time) 06/25/2013 12:00 am
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