They result from changes in pressure in that medium, like changes in air pressure. 它们来自于传播媒介中压力的改变,比如,空气中压力的改变。 So they can't travel through a vacuum, where there is no dense physical medium, which is why they can't travel through interplanetary space. 所以它们不...
What happens to waves when there is refraction in bays? What is true about the refractive index of a medium? What's the difference between diffraction and scattering of light? What is caused by light refraction in the atmosphere? The speed of light in a particular type of glass is 136,000...
This physics and property of a semiconductor makes it a good medium to use electricity in a controlled manner as and where required. Conductance of a semiconductor depends on several factors such as current or voltage applied to a control electrode, or on the intensity of irradiation by infrared...
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Mechanics is a branch of Physics dealing with the study of motion. This can be divided into two areas - kinematics, dealing with describing motions, and dynamics, dealing with the causes of motion.Answer and Explanation: Kinematics is the branch of classical mechanics that describes the motion ...
Which of the following is true? 3.推测谈话背景,辨认角色关系 这类试题在高中听力试题中约占5小题,要求我们从谈话或说话的话题和语气来推断出对话双方(或说话人)的职业身份,彼此之间(或与他人)的关系,对话发生的时间、地点或场合等。常见的提问方式有: ...
The quantum tunneling effect is a quantum phenomenon that occurs when particles move through a barrier that, according to the theories of classical physics, should be impossible to pass through. The barrier may be a physically impassable medium, such as an insulator or a vacuum, or a region of...
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depending on what medium the charges travel through and to what surfaces the charges are transferring. Charges equalizing through an air gap can result in a visible shock as the traveling electrons collide with electrons in the air, which become excited and release energy in the form of light...
We must include the energy momentum tensor term of matter in an appropriate manner to obtain the real black hole solution. Black hole is defined to be a star which has a radius less than it’s horizon size. That is, the star is completely inside it’s event horizon. We show in this ...