# Search results

1. ### Doppler effect and amplitude

i am sorry for my ignorance. i actually once wondered about speed of light in high refractive index but had never related it to Cherenkov Radiation. so thanks.
2. ### Eccentricity of orbits and gravitational energy

I am not going to start an argument but 1) i never asked to solve the question, my interest was in the approach ,which i thankfully got and was also the reason that i didn't bother about (2-K^2) part. It was just an eg. to indicate what was my topic. 2) i was writing it from my memory and...
3. ### Doppler effect and amplitude

well considering that we cant reach speed of EM waves it is safe to say that there are no chance of EM boom but what i think is what happens in case of transverse wave when its source moves faster than the speed of wave? .eg in case of wave on a string (i cant even imagine) As far as the...
4. ### Eccentricity of orbits and gravitational energy

Okay i found the question it does not say anything about the direction of velocity to be tangential or otherwise, so WHY are we taking it as tangential i have tried taking it at theta but it just didn't solve. and sorry it has been a while since i used r' notations.
5. ### Eccentricity of orbits and gravitational energy

two things 1) what is r' = 0 2)i understand tha r1 is the initial radius, but in last step you have used it for min distance which it cannot be becauseat min distance all its velocity must be perpendicular. Thanks btw!!
6. ### Eccentricity of orbits and gravitational energy

hello. i recently came across this question in which a satellite is put into orbit at a point around a planet with velocity 1.2V, where V is the speed for a circular orbit at that point and they ask for ratio of max to min distance. [Ans. 2.57] what i want to know is how do we relate...