A researcher is investigating a cubic crystal with x-rays. He is looking at Bragg reflection from the planes parallel to the cube faces.
He finds that when using x-rays of 0.165 nm a strong first maximum occurs when the beam makes an angle of 23.5 with the planes. What is the spacing of adjacent atoms in the crystal?
Question 2
Which two renewable energy resources provide the largest amount of energy today?
A) hydroelectric and wind
B) hydroelectric and biomass
C) active solar and photovoltaics
D) photovoltaics and wind
E) biomass and active solar
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