Answer:
Rafeal should compress or pull the end of the spring to increase its energy of vibration.
Step-by-step explanation:
Waves are phenomenon that causes a disturbance in a material medium without a permanent effect on the particles of the the medium. It had majorly two types; transverse and longitudinal.
Transverse waves are waves in which the direction of propagation of the wave generated is perpendicular to the direction of vibration of the particles of the medium. Examples are; water waves, light waves etc. But in longitudinal waves, the direction of propagation of the waves is the same as that of the particles of the medium. Examples are; waves in a slinky, waves in a spring etc.
Rafeal should compress the spring at the end or pull it at the end to increase its energy of vibration.