Why Does the Cepheid "Standard Candle" Have Limited Usefulness Beyond

question 64

Multiple Choice

Why does the Cepheid "standard candle" have limited usefulness beyond 20 Mpc?

• A)Distant galaxies are seen in the past, when Cepheid variables behaved differently than they dotoday.
• B)Distant galaxies are so young they do not contain Cepheids.
• C)Cepheids are too faint to be seen beyond that distance, even with HST.
• D)The light variability of Cepheids diminishes with distance so they do not appear to vary there.
• E)Older distant Cepheids are of Population II, where the period-luminosity relation no longerworks.

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Exclusive Territorial Distributorship

A business agreement granting one distributor the sole rights to sell a product or service within a specified geographic area.

Requirement Contracts

Contracts in which a buyer agrees to purchase a specific quantity of goods or services from a seller over a set period, often with agreed-upon terms and prices.

Per Se Illegal

Describes actions or behaviors that are considered illegal in and of themselves, without needing further examination of their context or effects.

Price Fixing

An illegal agreement between participants on the same side in a market to buy or sell a product, service, or commodity only at a fixed price or maintain the market conditions so that the price is maintained at a given level by controlling supply and demand.