HOU 5 - Ruchi Sharma HOU Monday-Wednesday Chapter 5 Light...

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Ruchi Sharma February 13, 2008 HOU: Monday-Wednesday Chapter 5: Light and Matter Week 5 Review Questions: 2. What is Spectrum , and how do we see one? It is the complete spectrum of light, and light it self is called electromagnetic radiation. The Spectrum of visible light splits into rainbow of colors that only a tiny part of the complete range’s light wavelength. Visible light is different from other forms of light because of the wavelength and frequency of the photons. Visible light ranges from 400 to 700 nanometers. Lights longer than red light is called infrared while radio waves are the longest wavelength light. The region between the two is referred to as microwave. On the other side of the spectrum, lights with shorter wavelength than blue light are called ultraviolet. And lights with even shorter wavelengths are called X Rays and the shortest is Gamma Rays. 3. Give examples from everyday life of the for major interactions we see between matter and light. Radio Waves cause electrons to move up and down so that a car radio receives the radio waves coming to us. Receptors in out eyes respond to visible light photons, and X Ray have enough photons to penetrate in our skin. 4. How does a particle differ from a wave in everyday life? Define wavelength, frequency, and speed. Marbles, baseballs, and atoms are examples of particles. A particle of matter can sit still or move from one place to another. The effect of a particle, for example, on water can create a ripple with waves consisting of peaks, where water is the highest and troughs, where water is the lowest. Wavelength: Distance from one peak to the next. Frequency: Number of peaks passing at any given point Speed: How fast peaks travel across a pond 5. What do we mean by light being an electromagnetic wave? How is wavelength related to electromagnetic wave? Light waves are basically vibrations of both electric and magnetic fields caused by motions of charges particles, which is why they are referred to as electromagnetic waves. The vibrations of the electric field in an electromagnetic wave will cause electrons to go up and down. Fields associate with forces, such as electric and magnetic fields, which describe the strength of the force which any particle experiences as they go through The forces that charged particles exert on another is electric and magnetic fields. 6. What is a photon? In what ways is a photon like a particle? In what ways, is it like

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a wave? Light can behave both as a wave and a particle. Each photon is characterized by waves and frequency. Each photon of light carries a particular radiative energy. The shorter the wavelength, the higher the energy of the photon. The wavelength, frequency and energy are all related in specific ways, so that all photons of light travel through space at the same speed- the speed of light.
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