A neutron, with kinetic energy KE and moving with velocity \(v\), collides head on with a nucleus of mass number \(A\) perfectly elastically. The fraction of total energy possessed by the neutron transferred to nucleus is (A) \(\dfrac{4A}{(A+1)^2}\) (B) \(\left(\dfrac{A-1}{A+1}\right)^2\) (C) \(\left(\dfrac{A+1}{2A}\right)^2\) (D) \(\left(\dfrac{A-1}{2A}\right)^2\)
Which is true about Rochelle's salt and lead zirconate? (A) Rochelle's salt is ferroelectric while lead zirconate is anti-ferroelectric (B) Rochelle's salt is anti-ferroelectric and lead zirconate is ferroelectric (C) Both are ferroelectric (D) Both are anti- ferroelectric
The wave function (in SI units) for an electromagnetic wave is given as \(\psi (x,t)={ 10 }^{ 3 }\sin p{ \left( 3\times { 10 }^{ 6 }x-9\times { 10 }^{ 14 }t \right) } \).The speed of the wave is:
Pragya Raptor code around a circular path of radius 4 cm and cut off the length required to the end. Then she wrapped it around a square box of side 4 cm did she have any code left?