TAILIEUCHUNG - Physics exercises_solution: Chapter 16

Bộ tài liệu bài tập tham khảo môn vật lý bậc đại học bằng tiếng anh Chapter 16 | a 1 v f 344 m s 100 Hz . b if p 1000p0 then A 1000A0 Therefore the amplitude is x 10 m. c Since pmax BkA increasing pmax while keeping A constant requires decreasing k and increasing n by the same factor. Therefore the new wavelength is m 20 m fnew fr 50 Hz. A p aA Pa 1480ms or A x 10 m. The much higher bulk modulus 2nBf 2n Pa 1000Hz increases both the needed pressure amplitude and the speed but the speed is proportional to the square root of the bulk modulus. The overall effect is that for such a large bulk modulus large pressure amplitudes are needed to produce a given displacement. From Eq. pmax BkA 2n BA 1 2nBA f v. a 2n x 105 Pa x 10 m 150 Hz 344 m s . b 10 x Pa . c 100 x 778Pa. The amplitude at 1500 Hz exceeds the pain threshold and at 15 000 Hz the sound would be unbearable. The values from Example are B x104Pa f 1000 Hz A 1 QvIO 8 m T Tqi tier pYatTrnl a 1 S v 44 m q 216K QQS m I q qh a nrAQQi ita 21 1. x i v m. usiii g i iii_pie 1-kJ. .7 v i i s 293K. 2 a f s s Liie jiessu-ie 2nf amplitude of this wave is pmax BkA B A x 104 Pa . v 2n 1000Hz x 10-8 m x 10- 3 Pa. This is x 10 3 Pa x 10 2 Pa 295 Is times smaller than the pressure amplitude at sea level Example 16-1 so pressure amplitude decreases with altitude for constant frequency and displacement amplitude. a Using Equation B v 2p 1f 2 so B 8m 400 s 2 x 1300 kg m3 x 1010Pa. b Using Equation Y v2p Z t 2p m x 10-4 s 2 x 6400 kg m3 x 1010 Pa. a The time for the wave to travel to Caracas was 9 min 39 s 579 s and the speed was x104 m s keeping an extra figure . Similarly the time for the wave to travel to Kevo was 680 s for a speed of x 104 m s and the time to travel to Vienna was 767 s for a speed of m s. The average speed for these three measurements is x 104 m s. Due to variations in density or reflections a

TỪ KHÓA LIÊN QUAN
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.