please solve using physics 30

PHYSICS 30 Unit VII Electromagnetic Radiation Chapter 13: The wave model can be used to describe the characteristics of electromagnetic radiation. Worksheet 1. Medical technologies related to imaging and cancer treatment use high-frequency EMR What are two precautions that medical personnel take when working with these types of technologies? (2 marks) 2. What is ionizing radiation and why is it dangerous? (1 mark) 3. A student measures the period of an electromagnetic wave as 3.64 x 105 s. a. What is the frequency? (2 marks) b. What is the wavelength of the wave? (2 marks) c. To which part of the electromagnetic spectrum does the wave belong? (1 mark) 4. What new concept did Maxwell introduce? (1 mark) 5. A converging mirror has a focal length of 20 em. The object is placed 30 cm in front of the mirror. Where will the image appear? (2 marks) 6. A converging lens creates an image that has a magnification of -3.0. The image is located 0.070 m from the mirror. a. Where is the object located? (2 marks) b. What is the mirror's focal length? (2 marks) 7. What is the critical angle for light with an ethanol/air boundary? (include a labeled diagram) (3 marks) 8. A scuba diver looks up from underwater. The light from the sun strikes the water at an angle of incidence of 50%, The light then goes from the water into the divers lucite mask and into the air. What is the angle of refraction when the light is in the lucite mask? (2 marks) 9. A scientist is double-checking the wavelength of a new laser. The scientist sets up a diffraction grating with 5.0010 m between slits, in front of the laser 1.50 m in front of a screen. The scientist measures the distance from the central maximum to the second bright fringe, which is 0.330 m. What is the wavelength of the laser? (2 marks) 10. A laser with a wavelength of 550 nm is shone through a diffraction grating. At an angle of 7.9" the light forms a first dark fringe when the screen is 50 em from the grating. What is the number of grooves per mm for the diffraction grating