One Fairly Crude Method of Determining the Size of a Molecule

question 2

Multiple Choice

One fairly crude method of determining the size of a molecule is to treat the molecule as an infinite square well (a box) with an electron trapped inside, and to measure the wavelengths of emitted photons. If the photon emitted during the n = 2 to n = 1 transition has wavelength 1940 nm, what is the width of the molecule? (c = 3.00 × 10⁸ m/s, h = 6.626 × 10^-34J ∙ s, ^mel = 9.11 × 10^-31 kg)

• A) 1.33 nm
• B) 1.12 nm
• C) 1.21 nm
• D) 1.45 nm

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Definitions:

Diploid Cells

Cells that have two complete sets of chromosomes, one from each parent, characteristic of most organisms’ body cells.

Inguinal Canal

A passage in the anterior abdominal wall that in males conveys the spermatic cord and in females the round ligament of the uterus.

Vas Deferens

(vas deferens) (pl., vasa deferentia) One of the paired sperm ducts that connects the epididymis of the testis to the ejaculatory duct.

Bulbourethral Gland

A pair of small glands found in the male reproductive system that produce a clear, lubricating fluid forming part of the semen.