A Single Slit Is Illuminated at Normal Incidence with a Parallel

question 32

Multiple Choice

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,m_el = 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

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Definitions:

Archaea

One of the two prokaryotic domains of life. Archaea superficially resemble bacteria, but they are distinguished by a number of unique biochemical features.

Genetic Polymorphism

The simultaneous occurrence of two or more discrete phenotypes within a population. In the simplest case, each phenotype results from a different allele or combination of alleles of a single gene. In more complex cases, the phenotypes result from complex interactions between many different genes and the environment.

Phenotypes

The set of visible or measurable traits of an organism that arise from the interaction of its genotype with the environment.

Population

A population consisting of members of the same species who live and reproduce within a specific region.