Why is Bohr's theory a semiclassical quantum theory
According to classical electrodynamics, electrons in accelerating motion will radiate electromagnetic waves, resulting in continuous energy loss, but Bohr model can't explain why
On the concrete concept of quantum theory
The meaning of quantum,
Quantum refers to the state of atoms, neutrons, protons and other particles, which can characterize the energy, rotation, motion, magnetic field and other physical properties of particles. "Quantum teleportation" is to transfer particles from one place to another in a moment, as if through the "space-time tunnel"
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- 1. Physics problem -- quantum theory Pauli's incompatibility principle, 1) It is impossible to have more than two electrons in the same quantum state 2) It is impossible for more than two photons to be in the same quantum state 3) It is impossible to have more than two electrons in the same energy level, that is, with exactly the same energy 4) It is impossible to have more than two electrons in the same orbit with the same angular momentum The above sentences are right. Why are the others wrong? What's wrong? (multiple choice) There is no basis for the following facts 1) Positron, as the antiparticle of electron, was detected by Anderson in 1932 from the cloud chamber of cosmic ray. So the positron prediction was confirmed 2) Scientists observed a sea of particles in the cloud chamber 3) Electron pairs (negative) and positron can be excited from vacuum 4) Dirac imagines that the hole in the sea of electrons is a positron Say according to (single choice) The following statement is not accurate 1) The movement of micro material system does not meet the strict law of cause and effect, and does not conform to the principle of pure determinism 2) The motion of micro material system has statistical law 3) It is Einstein's expectation that the unified field theory of construction determinism can be used as a "complete" description of the objective material world 4) Einstein himself has been thinking for 50 years, but he is still trying to figure out what light quantum is and what the mechanism of quantum transition is, so he has always opposed the concept of quantum Single choice and give reasons By describing the structure of the electron shell, physicists began to describe the quantum state, and physicists began to clearly mark the quantum state 1) The quantum state of a microscopic particle is represented by a set of quantum numbers 2) Different quantum numbers lead to different quantum states 3) The angular momentum of the electron orbit can only be taken as some discrete values, and the direction is not specified 4) Each quantum number indicates that the corresponding mechanical quantity is quantized Single choice and give reasons
- 2. A classic physics problem The teacher provided the following equipment: a constant voltage power supply (unknown voltage), a resistance Rx to be measured, a sliding rheostat (the maximum resistance is R0), an ammeter (or voltmeter) with appropriate range, two single pole switches, and several wires. Please select some of the equipment given to complete the resistance RX experiment with four different methods ① Draw the experimental circuit diagram ② Write out the main steps of the experiment ③ Write the expression of Rx
- 3. Work and heat transfer are important for changing the internal energy of a body________ Yes, please reply,
- 4. After cutting off a section of the spring of an accurate spring scale, readjust the zero point, and then measure the gravity of the same object, the reading is compared with the original () A. Bigger B. smaller C. unchanged D. uncertain
- 5. Examples of low carbon life
- 6. What is low carbon life (for example)? Why low carbon life? (behavior)
- 7. The electric power of a bulb is 40W (= 40J / s)__________
- 8. Measure the power of the small bulb 1. What is the power of the small bulb marked with "2.5V 0.3A"________ W. To make it shine normally, it must be grounded______ V in the circuit 2. If a small bulb marked with "2.5V 0.3A" is connected to a 2V circuit and the measured current passing through it is 0.25A, then the rated power of the small bulb is_________ W. What is the actual power_________ W. 3. The brightness of the small bulb depends on () A. Voltage B. current C. actual power D. rated power
- 9. How to calculate the conversion power and mechanical power? How to calculate the motor energy conversion power η and the motor output mechanical power p?
- 10. The power of a machine is one kilowatt
- 11. Classical physical selection Two short and thick pipes are connected on both sides of the container. They are bent upward to make two water sprayers. However, one of the nozzles shrinks into a nozzle, and the other nozzle is completely open A. the water flow from the big pipe is higher than that from the small pipe C both of the water jet is as high, C can't judge, please explain!
- 12. The main achievements of ancient physics in China
- 13. Achievements of physics in ancient China Don't need too complex, brief introduction, can introduce people and things clearly
- 14. The main factors affecting climate are a. latitude B. geomorphology C. atmospheric circulation D. land sea distribution But I'm wrong in choosing a
- 15. Using atmospheric circulation to explain some geographical phenomena
- 16. What is the relationship between pressure belt, wind belt, land sea distribution, atmospheric circulation and monsoon? Who can connect them, Just say it briefly
- 17. What is the function of water?
- 18. Distribution of climate types in the world
- 19. Characteristics and distribution causes of world climate types (in tabular form)
- 20. The relationship between ocean current, atmospheric circulation and climate types