We Can Identify Only a Fraction of All the Radio

question 69

Multiple Choice

We can identify only a fraction of all the radio pulsars that exist in our galaxy because

• A) gas and dust efficiently block radio photons.
• B) few swing their beam of synchrotron emission in our direction.
• C) most have evolved to become black holes, which emit no light.
• D) massive stars are very rare.
• E) neutron stars have tiny radii and are hard to detect even with large telescopes.

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Definitions:

STDEV.P(data range)

A function in spreadsheet software that calculates the standard deviation of a dataset, considering the entire population.

STDEV.S(data range)

A statistical function in spreadsheet programs used to calculate the standard deviation for a sample set of data, indicating data variability.

Measures of Central Tendency

Statistical indicators that describe the center point or typical value of a dataset, including the mean, median, and mode.

Standard Deviation

A gauge for the degree of spread or variability among figures in a collection.