The spacing of the atoms of a crystal is 159 pm. A monoenergetic beam of neutrons directed normally at the surface of the crystal undergoes first order diffraction at an angle of 58° from the normal
What is the energy of each of the neutrons? (mneutron = 1.675 × 10-27 kg, 1 eV = 1.6 × 10-19 J, h = 6.626 × 10-34 J ? s) A) 0.045 eV
B) 0.039 eV
C) 0.050 eV
D) 0.056 eV
E) 0.061 eV
A
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As a star evolves, heavier elements tend to form by various processes. Which of the following is NOT one of these processes?
A) proton capture and neutron capture B) fusion of like nuclei C) helium capture D) the s process E) neutronization
The process of planet formation in the early solar system is best described by which of the following terms?
A) precipitation B) consolidation C) condensation D) crystallization
The unit of density in the mks system is ______________
Fill in the blank(s) with correct word
A wave is traveling in a string at 60 m/s. When the tension is then increased 60%, what will be the resulting wave speed?
a. also 60 m/s c. 71 m/s b. 76 m/s d. 55 m/s