If you changed out a 10-Watt lightbulb with a 100-Watt lightbulb, what would you observe? O The frequency of the emitted light would increase by a factor of 10. O The lightbulb would emit longer wavelengths O The lightbulb would now be brighter or more luminous O The lightbulb would now be redder in color

If you changed out a 10-Watt lightbulb with a 100-Watt lightbulb, what would you observe? O The frequency of the emitted light would increase by a factor of 10. O The lightbulb would emit longer wavelengths O The lightbulb would now be brighter or more luminous O The lightbulb would now be redder in color

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter7: Work, Energy, And Energy Resources

Section: Chapter Questions

Problem 31PE: Suppose a star 1000 times brighter than our Sun (that is, emitting 1000 times the power) suddenly...

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Suppose a star 1000 times brighter than our Sun (that is, emitting 1000 times the power) suddenly goes supernova. Using data from Table 7.3: (a) By what factor does its power output increase? (b) How many times brighter than our entire Milky Way galaxy is the supernova? (c) Based on your answers, discuss whether it should be possible to observe supernovas in distant galaxies. Note that there are on the order of 1011 observable galaxies, the average brightness of which is somewhat less than our own galaxy.
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Radio telescopes are telescopes used for the detection of radio emission from space. Because radio waves have much longer wavelengths than visible light, the diameter of a radio telescope must be very large to provide good resolution. For example, the radio telescope in Penticton, BC in Canada, has a diameter of 26 m and can be operated at frequencies as high as 6.6 GHz. (a) What is the wavelength corresponding to this frequency? (b) What is the angular separation of two radio sources that can be resolved by this telescope? (c) Compare the telescope’s resolution with the angular size of the moon.
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