Transverse waves can be produced on a rope by moving one end of the rope up and down.The movement causes motion in the particles that make up the rope and the rope itself becomes the medium. The particles move perpendicular to the propagation. The movement also causes crests(highest point of the wave) and troughs (lowest point of the wave) which move along the direction of propagation.
In the blank there will be WAVELENGTH.
In a longitudinal wave, the WAVELENGTH is the distance from one compression to the next compression or from one rarefaction to the next rarefaction.
During endothermic reaction, thermal energy is absorb by the system from the surrounding. The correct option is C.