4. Four wave sources are transmitted into a testing box: green laser, siren, ultraviolet lamp, and a tuning fork. The waves enter the testing box through the opening. Inside the box are three sections. The air and water sections are
separated by transparent glass. The water section and the vacuum chamber are separated by a transparent plastic
pane. Which waves will be detected?
Testing Box
Opening
Detector
07
A. green laser and UV lamp
B. UV lamp and siren
C. green laser and tuning form
D. siren and tuning fork
Vacuum
Water
Glass
Plastic chamber