## A question from velocity time graph

if graph of velocity v and time t for a particle moving along straight line is parabola symmetric about time axis, then the relation between acceleration a and time t for particle is …. ? (Divya posted this question)

## Why electrons cannot be accelerated using a cyclotron?

In a cyclotron, the most important condition is that of the cyclotron frequency. The frequency of the square wave oscillator connected to the dees of the cyclotron must match the frequency of revolution of the charged particle being accelerated. For ordinary ions, once the  frequency is set there is no need to change or adjust the frequency. The [...]

## A problem from light for class X

Sudhanshu Misra posted:

“An object is placed at a distance of 10cm from convex mirror of focal length15cm; find the position and nature of image?”

Ans:

f= 15 cm

u=-10 cm

v=?

substitute the values