Recent content by Rainbow

About the moving electrons that you mentioned- I think we need to specify that the motion be accelerated. Right? As, as far as I know, uniformly moving charge particles do not produce(or emit) em radiation, only the accelerated ones do. Well, I would like to point out another thing in this...

I am an undergraduate student. But I would like to have the most accurate answer no matter what level. Even if the explanation happens to go over my head initially, I'll try my best and understand it. Thank you.

What are the ways (both natural and artificial) in which em radiation is generated? Here is one of the methods: We take a point charge (or more practically a charged sphere with uniform charge distribution) such that we can voluntarily fluctuate the amount of charge on it. We fluctuate the...

Thank you. I'll go through the links that you provided and let you know if I have any questions.

I'm sorry for not being specific. I meant, I couldn't get the working of the circuit arrangement for studying the input and output characteristics of n-p-n transistor in CE configuration. I want a complete description of the whole thing

Greetings Can somebody please help me understand the use of transistor as a switch and that as an amplifier?

Thank you for the help.

Let us consider a free electron in space, which is initially at rest. Now let us consider a photon of frequency f, which collides with our free electron giving all its energy to it. This energy will manifest itself as the K.E. of the electron after the collision. Therefore, we can write...

Oh now I get it. In case of the sun-earth system, the gravitaional force is an internal force, which cannot cause any change in the angular momentum of the system. And here, though the speed of the planet changes due to the force, the distance of the planet from the sun also changes by just the...

But when I draw a diagram of the situation I mentioned in my question, I get something like this(view attachment).

Something like that Sir.

D H, I'm sorry but, I'm not clearly getting what you said. Could you kindly elaborate what you said.

As you said, that the planet will be "moving in a straight with a constant velocity", which essentially means that no net non-zero force is acting on the planet. This is the reason why it sweeps equal areas in equal times. This is a similar argument which I gave in my second post in this thread...

You are very correct in saying that the L in an isolated "system" is conserved. But here I'm talking about the L of the Earth (a component of the sun-earth system). And conservation of L in a system doesn't essentially mean that the L of the individual components of the system cannot change.

Because, only if the eccentricity of the orbit is zero and if the sun is exactly at the centre, the force of gravity on the Earth will be radial and it will have no tangential component. No tangential component means no net torque, and no torque means that the L remains constant.