A Distant Galaxy Is Emitting Light from the Helium Spectrum

question 12

Short Answer

A distant galaxy is emitting light from the helium spectrum at 388.9 nm. On Earth the wavelength of the light from this galaxy is measured to be 540.6 nm. Estimate how far from Earth (in light-years) this galaxy is if the Hubble constant has the value 22 km/s per million light-years. (c = 3.00 × 10⁸ m/s, 1 ly = 9.461 × 10¹⁵ m, 1 y = 3.156 × 10⁷ s)

Understand the concept of regression and its use in predicting relationships between dependent and independent variables.

Identify and calculate the correlation coefficient and understand its significance.

Differentiate between positive, negative, and no linear relationship between two quantitative variables.

Interpret the slope and intercept of a least-squares regression line.

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