15. A photon of energy 3 keV collides elastically with an electron initially at rest. If the photon emerges at an angle of 60°, calculate
(a) the kinetic energy of the recoiling electron and
(4mks)
(b) the angle at which the electron recoils.
(4mks)
I​

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.

false

explanation:

boats, things on boats luggage are way more heavy then water.

temp rises, and expansion