6. {a} How many gray scale levels are there in a 3-bit system? [b] If an image has 256 K 256 pixels, how much memory.r in bytes is required for storage for each image slice? {c} If there are 32 image slices, how much memory.' storage [in bytes} is required overall to store the 3D image? 7'. If )wz-ra'}.r photons with intensity of 10 'u'lie'r'm2 of energy T0 ke'v' travels through 3 cm of skeletal muscle: {a} What will the intensity of the photon be at the exit of the muscle? lb} If it travels another 10 cm in air before reaching a detector, what is the intensity of the photon at the detector? 8. What is the maximum energy [in J and in eV} of a photon that will be produced by electrons accelerated through a cathode ray tube with a copper anode and voltage of ?C!.Cl k'v' between the anode and cathode