Final answer:
The video signal produced by a camera tube is amplified by the camera control unit, which is responsible for processing and boosting the signal. CRTs can potentially create X-rays when high-speed electrons collide with materials, but protective measures are often in place.
Step-by-step explanation:
The student has asked which component amplifies the video signal produced by a camera tube. The correct answer is the camera control unit. It is responsible for processing and amplifying the video signal that comes from the camera before it gets displayed on a monitor or recorded. Therefore, the video signal produced by the camera tube is amplified by the camera control unit.
As for the additional information provided on cathode ray tubes (CRTs), when CRTs accelerate electrons to high speeds using an approximately 30-kV accelerating potential, and these electrons strike the screen's phosphors, light is emitted to form images. Moreover, X-rays could also be created due to high-speed electrons colliding with the material of the CRT, although modern CRTs are designed with shielding to protect users from X-ray emissions.