The age of a star cluster can be approximated by finding its turnoff point in the distribution of data points that represent stars on the H-R Diagram
a. True
b. False
Indicate whether the statement is true or false
True
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A solenoid 20. cm long is wound with 5000. turns of wire. What magnetic field is produced at the center of the solenoid when a current of 10. A flows?
A) 1.4 T B) 0.84 T C) 1.6 T D) 0.67 T E) 0.31 T
The latest observations suggest the ratio of matter to energy is about
A) 24/73. B) 24/76. C) 3/24. D) 27/73. E) 3/97.
A Doppler red shift indicates
a. a shift toward lower frequencies. b. a shift toward shorter wavelengths. c. that a light source is approaching relative to the observer. d. none of these.
As the temperature of a blackbody increases, the peak of its radiation curve moves
a. upward toward higher intensity b. downward toward lower intensity c. toward larger wavelength d. toward smaller wavelength e. none of the above