Standing waves can form in a box. A speaker enclosure has dimensions 10 cm × 15 cm × 20 cm. What are the lowest-frequency standing waves (at 20° C) that can form in the three directions?
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Standing waves can form in a box. A speaker enclosure has dimensions 10 cm × 15
cm × 20 cm. What are the lowest-frequency standing waves (at 20° C) that can
form in the three directions?
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- In a transverse progressive wave of 400Hz, the least distance between two adjacent points which have a phase difference of pi/2 rads is 0.40 m. What is the speed of the wave? 80 m/s 160 m/s 320 m/s 640 m/s 1280 m/s1. (a) What is the intensity in w/m of a laser beam used to burn away cancerous tissue that, when 90.0% absorbed, puts 540 J of energy into a circular spot 2.2 mm in diameter in 1.5 s? Hint: The laser is a collimated beam of light and does not produce a spherical wave. w/m? (b) Reflect on how this intensity compares to the average intensity of sunlight (about 1W/m) and the implications that would have if the laser beam entered your eye. Note how your answer depends on the time duration of the exposure. The intensity of a laser is about damaging if they enter your eye. times that of the sun, so clearly lasers can be veryA sound wave travels from air (Z 413 kg m2 s1) to a liquid with a density of (950 kg m3) and a speed of sound in it (1-cm s 75000). 1) What percentage of the wave is reflected at the boundary? 2) What percentage of the wave travels across the boundary?
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- Two progressive waves y (x, t) = A sin( 4 x – ot) and y2(x, t) = A sin(4x - - - ) travel in the same direction. Calculate the speed of the wave produced as a result of interference of these two waves. Take A = 5 cm, 1 = 4 m and w = 31.4 Hz. Provide your answer in Sl units.You know that you sound better when you sing in the shower. This has to do with the amplification of frequencies that correspond to the standing-wave resonances of the shower enclosure. A shower enclosure is created by adding glass doors and tile walls to a standard bathtub, so the enclosure has the dimensions of a standard tub, 0.75 m wide and 1.5 m long. Standing sound waves can be set up along either axis of the enclosure. What are the lowest two frequencies that correspond to resonances on each axis of the shower? These frequencies will be especially amplified. Assume a sound speed of 343 m/s.A tube, that is open at both ends, has a length of 14.8 cm. What are the first three frequencies that will resonanate in this tube, if the temperature is 16 degrees?