Which of the Following Statements Is TRUE

question 23

Multiple Choice

Which of the following statements is TRUE?

• A) A common reference compound for ¹H and ¹³C NMR is tetramethylsilane.
• B) Nuclear magnetic resonance spectroscopy uses the fact that some atomic nuclei, such as ¹H and ¹³C, have two nuclear spin states with different energies when exposed to a high potential difference.
• C) The energy difference between two nuclear spin states corresponds to the energy of photons in the microwave part of the electromagnetic spectrum.
• D) The energy difference between two nuclear spin states depends on the number of protons and neutrons in the atomic nucleus.
• E) The difference in absorption frequency of a nucleus outside the magnetic field and a nucleus inside the external magnetic field is called the chemical shift.

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Definitions:

Square Feet

A unit of area measurement used primarily in the United States, equal to the area of a square with sides of one foot.

Direct Method

A method of preparing the cash flow statement where major classes of gross cash receipts and gross cash payments are disclosed, providing a clear view of cash flow from operating activities.

Service Department

A division within a company responsible for providing support, maintenance, or other services to customers or other departments.

Number of Employees

A count of all individuals working for a company, including full-time, part-time, and temporary workers.