Qanday chastota f (chekinish)?

Poyezd harakatsiz havoda erga nisbatan 30,0 m / s tezlikda harakatlanadi. Poezd hushtagi chiqaradigan notaning chastotasi 262 Hz. Havodagi tovush tezligi 344 m / s ga teng bo'lishi kerak. Birinchi poezdga qarama-qarshi yo'nalishda erga nisbatan 18,0 m / s tezlikda harakatlanayotgan va undan chekinayotgan poezd yo'lovchisi qanday f (chekinish) eshitadi? Javobingizni herts bilan izohlang.


javob bering 1:

??? <- 30m / s (chiqarilgan 262Hz) [st.] 18m / s (eshitildimi? Hz) -> fd = f (v-vr) / (v + vs), (f = 262Hz, v = 344m / s, vr = 18m / s, vs = 30m / s) fd = 262 * (344-18) / (344 + 30) = 228.374 = 228.4 [Hz] taxminan.