(b) X-ray beam of wavelength 2.9 Å is diffracted from the plane of cubic crystal. The first order
diffraction is obtained at angle 35º. Calculate the
spacing between the planes. (Ans: 2.52 * 10-10m)

but it is sometime nessary to hit key points or subjects   but is sometimes to much reveiw if there was a way to slim down the redone work it would improve for every body.

many battles and wars (such as the one at gettysburg), are commemorated by statues or monuments, with some areas preserved as monuments and national parks. do you think this contradicts the message of "grass"? in at least 200 words, explain your thinking and cite evidence from the poem to support your opinion.