ANSWER THIS CORRECTLY ONLY IF YOU ARE FULLY CONFIDENT!!!!!!!!!!!!!!!!!!!!!!!!!!!

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ANSWER THIS CORRECTLY ONLY IF YOU ARE FULLY CONFIDENT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Problem 38.49 Part A An experiment was performed in which neutrons were shot through two slits spaced 0.10 mm apart and To two significant figures, what was the speed of the neutrons? Express your answer to two significant figures and include the appropriate units detected 3.5 m behind the slits. The following figure shows the detector output. Notice the 100 um scale on the figure. (Figure 1) ? Figure 1 of! u= 11.9. 108 m Submit My Answers Give Up Incorrect: Try Again; 5 attempts remaining 100 m Provide Feedback Continue

Explanation / Answer

The spacing between maxima is

dY=(2/3)*(100)=66.67 um

from

Y=lambda*L/d

(66.67*10-6)=lambda*3.5/(0.1*10-3)

lambda =1.905*10-9 m

speed of neutrons

v=h/m*lambda =(6.626*10-34)/(1.67*10-27)*(1.905*10-9)

v=208.3 m/s=2.1*102 m/s

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