Does the wind move in the same direction the whole day?

An electron enters a region of space in which there exists an electric field 'E' and magnetic field 'B'. If the electron continues to move in the same direction with same velocity as before, the NOT possible case among the following is

The apparent frequency and real frequency of sound are the same (A) If source of sound and observer are moving in the same direction with same speed (B) If source of sound and observer are moving in the opposite direction with the same speed

A train is moving at 30 m/s in still air. The frequency of the locomotive whistle is 500 Hz and the speed of sound is 345 m/s.what would be the apparent wavelengths in front of and behind the locomotive if a wind of speed 10 m/s were blowing in the same direction as that in which the locomotive is travelling?

Two spheres A and B moving in opposite directions have velocities of 10ms^(-1) and 20 ms^(-1) . The two spheres collide with each other elastically. If A continues to move in the same direction at 4 ms^(-1) , the velocity of sphere B just after the collision is

(A) : An electron moving with uniform velocity enters uniform magnetic field perpendicularly and then a uniform electric field in the same direction. Nature of paths followed by electron in both the fields will be same. (R) : The force applied by magnetic and electric field on electron are in the same direction.