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?
Wood of Gymnosperms is composed of (A) Only tracheids in the xylem (B) Only vessels and xylem parenchyma (C) Only fibres and xylem parenchyma (D) Only fibres and vessels