Recent content by jha192001

What do you mean by centre? does every body has a geometrical centre what does geometrical centre even mean?

Does the term center of mass of universe mean anything? Why why not?

yes sir, was i stubborn when any of my knowledge was corrected? Thanks for the quote.

Thanks this is best far..Thanks all of you

(1) Everybody ask a question thinking what they ready know to be correct. Thats what i did. Maybe you failed to understand this simple thing. I don't have a reference to video that's why i didnt stated it first and stated when needed. The only new thing you said were about the group velocity and...

Yes sir, But isn't that the explanation of the Doppler Effect? The question i put forward was the change the wave would go through in the two diffrent case mentioned above. Why doppler effect predicts diffrently on if the *Observer* is moving and on Source is only moving. << Post edited by a...

I stated the above statement cause i remembered a video in which they told that speed of light doesn't change in a medium infact light is absorbed and desorped by atoms and hence it appears it has slowed down tho it has it just follows a longer path. I watched the video a time ago and while i...

But still its not clear how does refraction occur. A change in speed doesn't signify change in direction. What cause the light to change the direction the same everytime

Sorry sir i am still not fully satisfied. For now let's only say about sound as a wave.(Not EM) The same question again. If only observer moves or only source. Whats the changes in both cases in the frequency,wavelength,speed of sounds as. heard by the object/observer. I know frequency changes...

(1)What is the real cause of refraction? Light wave cannot possible have a change of speed in going onto diffrent medium hence what is going on inside actually that we say its a change of speed. (2) I am notable to comprehend how a change in wavelength not always means a change in frequency. If...

I have seen few examples on Doppler effect and i am confused about one such. We are standing on ground. If the source of sound S moves and Object O is stationary. We would presume the frequency as well as wavelength of sound be changed to the obeject O. But if O moves towards or away from S...

Sir, B is in noninertial frame but as A is on Earth he himself is in one too..Then on what basis "B is youner" can be said. P.s: I am reading about lorentz rn

How many are the ways a Black hole without *ACCERTION DISK* can be spotted?

This is a gendenke experiment. You(A) and your friend (B) are on earth. Now your friend sits on a spaceship that can fly at speed of 0.1c. He flies for 5 year straight ahead(away from earth) and then returns back slowly. The answer that i get is B would have aged. Assuming this answer is right...

sir, if both the blocks are of equal masses then the maximum compression would. be seen. at the time they both stop momentarily and consecutively the first time..Hence their kinetic enengirs would turn into potential for spring. But my ques. of what if masses are unequal. one is m and. other...