Which Statement About Ultraviolet Radiation Is True

question 26

Multiple Choice

Which statement about ultraviolet radiation is true?

• A)It's best to avoid outdoor activity in the late afternoon,because the sun's rays are most intense after 3 P.M.
• B)Swimming is a good choice of outdoor activity,because ultraviolet rays cannot penetrate water.
• C)Sand reflects ultraviolet radiation,so beach-goers need to wear sunscreen even if they sit under a beach umbrella.
• D)Sunscreen is not needed at high elevations because the atmosphere at high altitude filters out most ultraviolet radiation.

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Definitions:

Betas

A measure of a stock's volatility in relation to the overall market; a beta above 1 indicates greater volatility than the overall market.

Multifactor Model

Model of security returns positing that returns respond to several systematic risk factors as well as firm-specific influences.

Explanatory Power

The ability of a statistical model to account for the variance in a given data set, explaining how well the model fits or predicts the outcomes.

Security Returns

The gains or losses from investing in a financial security, calculated based on the change in investment value and any income from the investment, like dividends.