III. Direction: Draw a if the statement is correct and draw at it is wrong
16. The light will be able to pass through when blocked with thick cardboard 17. Heat travels in air and water by convection
18. An accident will not happen if the light used by big buses or other modes of transportation was placed on the sides of the vehicle
19. Optical fibers are used in communication, medicine, and industry
20. A sound wave travels at a different spoed through different media​