Alaser with wavelength d/8 is shining light on a double slit with slit separation 0.450 mm . this results in an interference pattern on a screen a distance l away from the slits. we wish to shine a second laser, with a different wavelength, through the same slits. part a what is the wavelength λ2 of the second laser that would place its second maximum at the same location as the fourth minimum of the first laser, if d = 0.450 mm ? express your answer in millimeters.

Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control room’s ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronaut’s hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?