[Vật Lý 12] Chữa đề thi thử - Môn Vật Lý - Sở GD&ĐT Hải Phòng (Phần 1) - Thầy VNA

Hello everyone, Mr. Ngoc Anh here And I will continue to practice for you the question of Haiphong province Our goal is still 15-20 minutes to conquer 8 points Or better than that OK? Now, let's practice with me Question 1 The magnitude of the sound at one point 10 log of y over y0 Unit must be decibel And if it's Ben, it's not number 10 D is correct Our formula is The magnitude of the sound at one point With a straight line It's 2 times 10 log of y over r R is the distance The answer is B Got it? For example, with a circle-shaped string At the center, it's 2π times 10 log of y over r Got it? A straight line doesn't have π A circle doesn't have π Or is it B? Analyzing a complex column into single-column columns is called a light-emitting phenomenon 3 is A The light radiates from which substance? It's low-emission gas Radiation Got it? Low-emission, guys The wavelength is our particles Because of the movement of the column A is correct Our infrared has a very strong thermal effect D is correct The electrolyte in the conductor is electrons and holes Got it? B is correct With the conductor type N The electrolyte type N is mainly E And the type P is mainly holes Got it? The covalent nucleus 2760 Has 33 protons And Sorry, 33 neutrons And 27 protons Got it? 27 protons, 33 neutrons The answer is C This is the number of protons And take 60 times 27 is 33 It's neutrons The 9th question