• Use MAXWELL'S EQUATIONS to derive the GENERAL WAVE EQUATION • Derive the PLANE WAVE EQUATION from the derived wave equation above and show that the phase velocity of the wave particles travel at a speed of 300000000 m/s in free space (speed of light)
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- Chapter 13 question 45•10 E Underwater illusion. One clue used by your brain to determine Wavefronts, the direction of a source of sound is ! the time delay At between the arrival of the sound at the ear closer to the source and the arrival at the farther ear. Assume that the source is distant D so that a wavefront from it is approx- imately planar when it reaches you, and let D represent the separation between your ears. (a) If the source is located at angle 0 in front of you (Fig. 17-31), what is At in terms of D and the speed of sound v in air? (b) If you are submerged in water and the sound source is di- rectly to your right, what is At in terms of D and the speed of sound Vw in water? (c) Based on the time-delay clue, your brain interprets the submerged sound to arrive at an angle 0 from the forward direc- L Figure 17-31 Problem 10. tion. Evaluate ofor fresh water at 20°C.Assig Cengage Learning VHF, or very high frequency, refers to radio frequency electromagnetic waves in the range 30 to 300 MHz. In the U.S., television stations broadcast channels 2 through 13 in the VHF range betwe- 54.0 MHz and 216 MHz, with ranges 72.0 to 76.0 MHz and 88.0 to 174 MHz not utilized for TV broadcasting. Each channel has a frequency width of 6.00 MHz. The table below gives the lower and upper frequency of each channel. Channel 2 3 4 5 6 80 9 10 11 12 13 Lower edge (MHz) Upper edge (MHz) 54 60 66 76 82 174 180 186 192 198 204 210. m m m 60 m 66 72 EE 82 88 180 186 192 (a) Calculate the broadcast wavelength range for channel 2. (Enter your answers from smallest to largest, in m.) smallest value largest value 198 204 210 (b) Calculate the broadcast wavelength range for channel 5. (Enter your answers from smallest to largest, in m.). smallest value largest value 216 (c) Calculate the broadcast wavelength range for channel 6. (Enter your answers from smallest to largest, in…
- 71. •TWO identical speakers (1 and 2) are playing a tone with a frequency of 171.5 Hz, in phase (Figure 13-42). The speakers are located 6 m apart. Determine what points (A, B, C, D, or E, all separated by 1 m) will experience constructive interference along the line that is 6 m in front of the speakers. Point A is directly in front of speaker 1. The speed of sound is 343 m/s for this problem. SSM 6 m 1 6 m А В CD EGr 8 Sci Ben AHMAD, ASHNA 6 of 35 1 3 4. 6 As the tune A radio has two dials. The volume dial changes the loudness of the sound, and the tune dial changes the radio station. The loudness is measured in decibels, and the radio station is measured in waves per waves closer tuned to the second. The fre The fre volume O The an Ở tune I O The am ocilloscope attached to the antenna oscilloscope attached to the speakerTrue or False; if false, please explain why a) There are three classifications to damping: Overdamped, Critically damped, and Superdampedb) A system that is critically damped will return to rest faster than the same system when overdamped.c) Completely undamped simple harmonic motion is quite rare in the real world.d) A RLC series circuit is mathematically identical to a damped spring-mass oscillator.