This diagram shows the period-luminosity relationship. A Cepheid variable with a period of 5 days will have a luminosity of ________ solar luminosities
Fill in the blank(s) with correct word
1000
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Briefly explain how we can use spectral lines to determine an object's radial motion (toward or away from us). Can we also learn the object's tangential motion (across our line of sight) from its spectral lines?
What will be an ideal response?
Flux: A 2.00-m long metal wire is formed into a square and placed in the horizontal xy-plane. A uniform magnetic field is oriented at 30° above the horizontal with a strength of 0.344 T. What is the magnetic flux through the square due to this field?
A. 0.0745 T ? m2 B. 0.172 T ? m2 C. 0.0430 T ? m2 D. 0.298 T ? m2
Suppose an object is moving in a straight line at 50 mi/hr. According to Newton's first law of motion, the object will
A) continue to move in the same way forever, no matter what happens. B) continue to move in the same way until it is acted upon by a force. C) continue to move in a straight line forever if it is in space, but fall to the ground if it is on Earth. D) eventually slow down and come to a stop.
Dispersion results because the speed of light in a transparent medium varies with frequency
Indicate whether the statement is true or false