A single slit is illuminated at normal incidence with a parallel beam of light having a wavelength of 411 nm. The entire central band of the diffraction pattern is observed at 90.
The illumination is now replaced by a nonrelativistic beam of electrons, each having a kinetic energy of 980 eV. When this beam hits the slit at normal incidence, at what angle will the first minimum of the electron diffraction pattern occur? (h = 6.626 10-34 J s, mel = 9.11 10-31 kg, 1 eV = 1.60 10-19 J) A) 0.095 mrad
B) 0.071 mrad
C) 0.046 mrad
D) 0.12 mrad
E) 0.14 mrad
Question 2
Which of the following countries produces the most carbon from fossil fuels, per person?
A) China
B) Japan
C) Western Europe
D) United States
E) former Soviet Union
amino acids with single and three code
Normal bone versus bone with osteoporosis.
Common Laboratory Tests and Their Normal Values
(A) Tetralogy of Fallot; (B) normal anatomy.
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Energy flow in the light-dependent reactions of photosynthesis