An owl has good night vision because its eyes can detect a light intensity as small as 5.0 X 10'13 W/mz. What is the minimum number of photons per second that an owl eye can detect if its pupil has a diameter of 8.7 mm and the light has a wavelength of 566 nm? Number n Units v An incident Xray photon of wavelength 0.2973 nm is scattered from an electron that is initially at rest. The photon is scattered at an angle of 9 : 1800" in the drawing and has a wavelength of 0.3022 nm. Use the conservation of linear momentum to nd the momentum gained by the electron. {a ~'\\.lUl/\\'>