![]() ![]() In the final lesson, lesson 5, students will apply the Doppler Effect to electromagnetic waves, and examine redshift as evidence of the expanding universe. Students will perform two investigations into how various media absorb and transmit light and complete two guided inquiry model group activities. In lesson 4, students will learn that electrons in atoms and molecules absorb visible light. Students will also learn how the Doppler effect is useful in our everyday lives with sirens and weather prediction. They will practice by using a Doppler ball and the Doppler equation. In Lesson 3, students will explore the Doppler effect. In diffraction the fringe width is directly proportional to the wavelength of the wave. Finally, students will research the science behind fireworks and how it relates to an electron’s energy. The correct option is B Wavelength of light waves is far smaller. c f, where c 3.00 × 108 m/s is the speed of light in vacuum, f is the frequency of the electromagnetic wave in Hz (or s 1 ), and is its wavelength in m. As we have seen previously, light obeys the equation. Visible light of wavelength 550 nm falls on a single slit and produces its second diffraction minimum at an angle of 45.0° relative to the incident direction of the light, as in Figure 11.7.5. ![]() Example 11.7.1: Calculating Single-Slit Diffraction. Then, students will participate in a flame test lab and will draw Bohr models for the element hydrogen, labeled with arrows to show the release and absorption of energy. We know that visible light is the type of electromagnetic wave to which our eyes responds. In fact, the central maximum is six times higher than shown here. In Lesson 2, students will watch a video of fireworks and write down what they notice and wonder. Sound travels by longitudinal waves, or waves in which the movement of vibration is in the same direction as the wave itself. Students will then research wave diffraction and use what they learned to build and test a spectroscope. Diffraction and Interference We know that visible light is the type of electromagnetic wave to which our eyes responds. They will use pencils to build a spectroscope and make observations as to the color and size of light. In Lesson 1, students will learn that light is formed by waves and can change direction through diffraction. The emitted waves are semicircular, and occur at t, time later. Get Unlimited Access to Test Series for 840+ Exams and much more. Each point on the wavefront emits a wave at speed, v. Diffraction of light, more precisely, happens when a light wave passes by a corner or through an opening or slit that is physically as tiny as, or even smaller than, that light’s wavelength. where s is the distance, v is the propagation speed, and t is time. The principle can be shown with the equation below: s vt (6.2.1) (6.2.1) s v t. This collection is a series of five lessons about diffraction of light and sound. Figure 1 shows a simple example of the Huygens’s Principle of diffraction. ![]()
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