Utah State University PHYSICS 3030 QUIZ 3 1)Star A and Star B have the same intrinsic luminosity

Physics Jun 23, 2021

Utah State University

PHYSICS 3030

QUIZ 3

1)Star A and Star B have the same intrinsic luminosity. If an astronomer measures a greater flux (more photons per second) from Star A than from Star B, which is closer?

2. The inverse squared law works for spherical sources or point sources because the Surface Area of a sphere will scale like 1/r2 in this type of equation.

3. Which of the following wavelengths of light has the highest energy?

4. Which of the following frequencies of light has the highest energy?

5. In order to calculate the distance to a certain cepheid variable star you would need to measure the Flux (the amount of light seen per unit area) and observe the star long enough to measure the Period of the oscillation. You could then use the relationship first found by Henrietta Leavitt to calculate the intrinsic Luminosity of the star.

6. Two stars known to have the same intrinsic luminosity. If the flux from Star A is measured to be 9 times the flux of Star B, which of the following statements is true about their relative distances from the Earth.

7. True or False. You measure the flux from a star. All that is known about this star is the flux measurement. You can still use this data to calculate the distance to the star.

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