two objects attract each other gravitationally with a force of 2.1×10−10 n when they are 0.50 m apart. their total mass is 4.8 kg .

The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656(red) and 486 (blue). light from a hydrogen lamp illuminates a diffraction grating with 500 lines per mm, and the light is observed on a screen 1.50 behind the grating. what is the distance between the first-order red and blue fringes?