Photons in a Laser Beam Have the Same Energy, Wavelength

question 70

Multiple Choice

Photons in a laser beam have the same energy, wavelength, polarization direction, and phase because:

• A)each is produced in an emission that is stimulated by another
• B)all come from the same atom
• C)the lasing material has only two quantum states
• D)all photons are alike, no matter what their source
• E)none of the above

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Definitions:

Phenyl Isothiocyanate

A chemical reagent used in the Edman degradation method for sequencing amino acids in peptides.

N-terminal

The N-terminal refers to the start or initiating end of a polypeptide or protein, characterized by the presence of an amino group (-NH2).

Amino Acid

A molecule that combines to form proteins, containing a basic amino group, an acidic carboxyl group, and a unique side chain, serving as the building block of proteins.

Sanger Reagent

A specific reagent used in biochemistry to label the N-terminus of proteins or peptides with a fluorescent marker.