4. Which of the following terms describes a disturbance that transfers energy from one point to the other
a. A vacuum
b. A medium
c. A wave
d. None of the above

5. Which of these is not true about gamma rays ? a. They can travel through a medium b. The energy of the wave increases as the frequency increases The energy of the wave increases as the length of the wavelength increases d. They can travel through spacel a vacuum

6. X rays are called ionizing radiation because a. The radiation removes electrons from atoms b. The radiation does not disrupt chemical bonds The radiation keeps living tissues in tact d. The radiation has low frequency