Yahoo奇摩 網頁搜尋

  1. internal energy 係 KE(kinetic energy) 加 PE (Potential eneergy) 而heat 係 KE 既一種 舉個例 如果你煲水,水溫上升,咁即係 KE 上升緊,不過因為無變形態,所以PE無變, overall 講就係 internal energy 升緊,同埋會 heat 緊D水 如果D 水變緊...

  2. 你應該參考生物學書本,簡單講,耳仔內有耳膜,耳骨,同神經未稍,聲音震動耳膜,傳入耳骨,刺激神經未稍產生訊號傳入大腦。

  3. Hear resistant materials can stand very high temperatures without ...

  4. ...vacuum, sound cannot be produced. Hence, we cannot hear the bell ring. 2. The speed in solid is faster. The...

  5. Alice will hear a loud sound since the path difference is 0,so it is a constructive interference Peter will hear a soft sound since the path difference is 10.2-6.8=3.4,so it is a destructive interference

  6. .... So, for the case of constructive interference, alternative loudness sound should be heard , as amplitude of the wave is still varying. But, for an ideal case...

  7. 43. Hear produced = (3.1x10^17).(50x10^3).(1.6x10^-19).(0.995) w = 2,468 w Answer...

  8. ...500 x (330 + 30)/(330 - 25) = 590 Hz So beats per second heard by the driver in D = 590 - 507 = 83 Hz

  9. the only reason to hear explosion sound in the movie is IT IS A MOVIE...wave, need media (like water, air, wall etc) to transfer so you CANNOT hear explosion in the space. actually you have already answer in yr question...

  10. ...observer and the source are moving towards each other. When you hear a pitch changing from high to low, the source and the observer are ...