help please what would be the correct answer for these question

' Question 1 0 / 1 pts Light having a wavelength of 700 nm shines on a diffraction grating. The third-order maximum is at an angle of 350. How many lines (slits) does the grating have per centimeter? 2.73 ' Question 2 0 / 1 Pts Smadar wants to project the entire visible spectrum (from about 380 nm to about 750 nm) on a screen 3.5 m away. To do this, she shines a source of white light (which contains all the colors) onto a diffraction grating which separates out all the colors. The grating has 553 lines (slits) per millimeter. How wide (in centimeters) is the m = 1 Spectrum on the screen? 248.95 >Question 3 0 l 1 pts When an electron in the ion He+ makes a transition from an initial energy level labeled by the integer m to a nal energy level labeled by the integer 71f, it emits light of a corresponding wavelength given by the following formula: 1 1 AugHy 2R 1 1 Consider the following three transitions specied using the notation m > nf: 5 a 3 6 > 3 7 > 3 If light from these transitions passes through a diffraction grating having 775 lines per millimeter and then hits a screen 1.2 meters away, what are the y-positions of the first- order spectral lines for each of these transitions? Write the smallest of these y- positions (in centimeters) in the answer box, and then draw a diagram of the spectral lines to scale lie. the relative spacing between the lines should be correct). 1.99