In Research News – More Evidence of sound waves carrying mass: ġ4. Videos to Watch: Visualizing Ultrasound with Schlieren Optics: Part 1 – Traveling Waves and Reflections: Part 2 – Diffraction and Standing Waves: Part 3 – Standing Waves in Colour: ġ3. Video to Watch: What Does Sound Look Like: ġ2. Article to Read – Space sound waves around Earth: Electrons whistle while they work?: ġ1. Extra Help – Energy Transport and the Amplitude of a Wave. Image Source: Valengilda/jStock/Getty ImagesĨ. Objects going through this Simple Harmonic Motion are known as Simple Harmonic OscillatorsĦ. Article to Read – Massive Bolivian earthquake reveals mountains 660 kilometers below our feet: Ĥ. Extra Help – Vibrations: Extra Help – The Nature of a Wave: ģ. If you are driving on a freeway at 90 km/h and a police car is approaching from behind at 160 km/h, emitting a siren with a varying frequency from 1-3 kHz, what range of frequencies would you hear in your car?ġ.Image Source: NOAA – Kelvin–Helmholtz instabilities taken over southern Missouri by pilot Shawn McCauley! These clouds look like breaking waves in the ocean because it is the same physical process.Ģ. (ii) as the firetruck moves away from you? Assume the siren is emitting a frequency of 1200 Hz.ĥ. If you are driving in the opposite lane at 90 km/h and hear the same firetruck described in the previous question, what frequencies do you hear as (ii) as the firetruck moves away from you? Assume the siren is emitting a frequency of 1200 Hz and the speed of sound on that day was 340 m/s.Ĥ. If a firetruck is racing past you at 110 km/h on a freeway beside a path you are walking on, what frequencies do you hear as At this instant there are 4 observers in all four directions, each at 200 m away from the ambulance. An ambulance is racing down a road at 70 km/h and hits the horn to warn vehicles in the intersection that it is approaching. What is the frequency of a sound that has a wavelength of 0.25 m where sound travels at 332 m/s?Ģ. (The critical angle is where the wave does not refract but instead reflects.)ġ4.4 The Doppler Effect 30 and Shock Waves F-18 Hornet Fighter Jet Official Navy Page from United States of America Seaman Phylicia A. What is the critical angle for a wavefront of 1.6 m wavelength traveling at 0.50 m/s that enters a medium where the wave speeds up to 0.75 m/s. (iii) At what incident angle would this wave front be completely reflected, with no refraction?Ħ. (ii) What are the angles of the reflected and refracted waves? (i) What are the wavelengths of the reflected and refracted waves? If this wave is angled at 28° to the normal and part of the wave is reflected and the rest of it refracted, find the following: Suppose you have a wavefront of 2.2 m wavelength traveling at 0.48 m/s that enters a medium where the wave speeds up to 0.84 m/s. What angle would separate the central constructive interference pattern and the fourth constructive interference pattern for two coherent wave generators separated by 12 cm that are generating waves 3.6 cm in length?ĥ. (ii) What distance separates these two constructive wave patterns on a viewing screen that is 0.60 m away from the wave sources?Ĥ. (i) At what angle would one find the second and third constructive wave interference patterns from the direction where the waves are headed? If you have two coherent wave sources 24 cm apart that are emitting waves of length 4.2 cm, find: How many constructive interference patterns will one be able to observe on a viewing screen under the following criteria: The waves are traveling at 0.84 m/s, have a frequency of 20 Hz, are created by two wave generators 18 cm apart, and are at a distance of 0.60 m away from a viewing screen that is 1.0 m in length.ģ. (iii) If these wave generators are creating interference patterns on a 0.96 m viewing screen, how many constructive interference patterns can be observed on this screen?Ģ. (ii) If these wave generators are 18 cm apart and are 0.64 m away from a viewing screen, what distance separates the central constructive interference pattern from the next constructive interference pattern? (i) What is the wavelength and period of the waves that are created? If these waves have a frequency of 24.0 Hz, find: Suppose you have two wave generators producing on a wave tank where the speed of the waves created are 1.4 m/s. QUESTIONS 14.3 Wave Properties – Reflection, Refraction, Interference and Diffractionġ. What is the speed of sound 1000 m below the ocean’s surface, where the temperature is 6.2 ☌ and the salinity is 4 parts per thousand? v_
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