Question

A neutron crystal spectrometer utilizes crystal planes of spacing d =

73.2 pm in a Beryllium crystal. What must be the Bragg’s angle so

that only neutrons of energy K = 4.2 eV are reflected? Consider only

fist order spectrum. solution step by step .


​

Answer 1

yoy tfret unop frggota btich

Answer 2

Answer:

2a sin 8 = nλ

h h

P √2mK

2d sin0 = n2=n

h

√2mK

= 1.398 × 10¹¹ m

= 5.48"

1.398×10

2×73.2×10-12

0 = sin