We can learn a lot about the properties of a star by studying its spectrum. All of the following statements are true except one. Which one?
A) The peak of the star's thermal emission tells us its temperature: Hotter stars peak at shorter (bluer) wavelengths.
B) The total amount of light in the spectrum tells us the star's radius.
C) We can identify chemical elements present in the star by recognizing patterns of spectral lines that correspond to particular chemicals.
D) We can look at Doppler shifts of spectral lines to determine the star's speed toward or away from us.
B
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Conversion of Units: The following conversion equivalents are given:1.00 gal = 231 in3 1.0 ft = 12 in 1.0 min = 60 s If a pipe delivers water at the rate of 95 gal/min, its rate of flow in ft3/s is closest to
A. 0.21 ft3/s. B. 0.19 ft3/s. C. 0.17 ft3/s. D. 0.15 ft3/s. E. 0.14 ft3/s.
A beam of light of wavelength 630 nm is incident on a slit that is 0.400 mm wide. If the distance between the slit and the screen is 1.80 m, what is the width on the screen of the central bright fringe?
A) 1.94 mm B) 2.94 mm C) 3.54 mm D) 5.67 mm E) 6.94 mm
Bluer stars are brighter than redder stars of the same size. Assume both are typical stars
a. True b. False Indicate whether the statement is true or false
The hydrogen spectrum has a red line at 656 nm, and a blue line at 434 nm. What is the first order angular separation between the two spectral lines obtained with a diffraction grating with 5000 rulings/cm?
a. 7.7° b. 16.6° c. 6.6° d. 3.2° e. 19.2°