When Hubble First Calculated the Recessional Speeds of Galaxies in the 1920s

question 123

Multiple Choice

When Hubble first calculated the recessional speeds of galaxies in the 1920s, he used

• A) the Doppler shift relationship. This was an error, and the calculations had to be repeated using the cosmological redshift relationship.
• B) the Doppler shift relationship. This was an error, and the calculations had to be repeated using the gravitational redshift relationship.
• C) the Doppler shift relationship. This was correct because the nonrelativistic cosmological redshift relationship gives the same result.
• D) the cosmological redshift relationship. This was an error, and the calculations had to be repeated using the Doppler shift relationship.

Explain the disparities in professional fields and how gender affects perceptions and opportunities.

Understand the physiological distinctions between males and females including chromosomes and hormone functions.

Recognize the impact of environmental factors on sexual development.

Understand the concept of gender roles and their cultural and social influences.

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Definitions:

Opportunity Cost

The cost of choosing one option over another, representing the benefits foregone from not choosing the next best alternative.

SUVs

Sport Utility Vehicles, a category of motor vehicles that combine elements of road-going passenger cars with features from off-road vehicles, like higher ground clearance and four-wheel drive.

Motorcycles

Two-wheeled vehicles powered by an engine, often used for transportation, recreation, or sport.

United States

A country located primarily in North America, consisting of 50 states, a federal district, five major self-governing territories, and various possessions.