A Spectral Line of a Certain Star Is Observed to Be

question 62

Multiple Choice

A spectral line of a certain star is observed to be "red shifted" from a wavelength of 500 nm to a wavelength of 1500 nm.Interpreting this as a Doppler effect, the speed of recession of this star is:

• A)0.33c
• B)0.50c
• C)0.71c
• D)0.80c
• E)c

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Definitions:

Osmole

A unit of measurement for the number of particles that contribute to the osmotic pressure of a solution.

Solute

A substance dissolved in another substance, typically the component of a solution present in the lesser amount.

Normal Blood pH

The typical pH range of human blood, which is tightly regulated to stay between 7.35 and 7.45.

Blood pH

The measure of acidity or alkalinity of the blood, normally maintained within a tightly regulated range of about 7.35 to 7.45.