What form of electromagnetic radiation can most effectively penetrate human tissue? a. visible light b. microwaves c. uv light d. x-rays

Which of the following is a measure of the amount of light a star directly emits?               a.  luminosity    b.  intensity    c.  wavelength    d.  brightness

Patients with brain tumors may elect to have a procedure known as gamma knife. in a typical gamma knife procedure gamma rays are directed toward a tumor with contact to surrounding tissues. limiting contact between gamma rays and healthy tissue is important because

Isaac walks 4 blocks north. then he turns he turns around and walks 1 block south. which of the following correctly describes isaac's motion