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Quasars, an abbreviation for quasi-stellar radio sources, are distant objects that look like stars through a telescope but that emit far more
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- If we consider a weak gravitational field, we can write a simple expression for gravitational time dilation. Looking from a region distant from the gravitating body, light will appear to travel more slowly due to this time dilation. We can model this as a refractive index, with n > 1. What refractive index distribution in a spherical lens mimics gravitational deflection by an object? If we replace the lens by a thin plate of varying thickness, what is the required thickness?arrow_forwardYou want a telescope that discerns objects that are at least 5.10 * 10-7 radians apart. To achieve this resolution, determine what the diameter of the primary mirror must be if you are making observations at a wavelength of 583 nm. A binary star system is 41.3 ly away. the two stars would just barely be able to be discerned by your telescope. determine the minimum distance between the stars. ly = 9.461 *1015arrow_forwardhelp me please, this is my review for my exam tomorrowarrow_forward
- The bright star Mintaka (also known as δ Orionis,the western most star of Orion’s belt) is extremely close to the celestial equator. Amateur astronomers can determine the field of view of their telescope (that is the angular width of the region that they can see through the telescope) by timing how long it takes Mintaka to drift through the field of view when the telescope is held stationary in hour angle. How long does it takeMintaka to drift through a 1 degree field of view?arrow_forwardA train is moving at a speed of v towards the railwayman next to the rails. The train whistles for a time of T. How long does the railwayman hear the whistle? The speed of sound is c= 330 m/s; v=108 km/hour= 3) m/s, T= 3s; the train does not reach the railwayman until the end of the whistle. %3Darrow_forwardYou're inside a metal building that blocks radio waves, but you're trying to make a call with your cell phone, which broadcasts at a frequency of 950 MHz. Down the hall from you is a narrow win- dow measuring 35 cm wide. What's the horizontal angular width of the beam (i.e., the angle between the first minima) from your phone as it emerges from the window?arrow_forward
- Consider a typical red laser pointer with wavelength 649 nm. What is the light's frequency in hertz? (Recall the speed of light c = 3.0 × 108 m/s.) f =arrow_forwardA child sees a coin apparently 24 cm from the top surface of a plastic plate. The coin is actually under the rectangular plate 30 cm thick. What is the velocity of light in plastic plate? 1.2 x 108 m/s 0.3 x 108 m/s 2.4 x 108 m/s 3.5 x 108 m/sarrow_forwardOften in optics scientists take advantage of effects that require very high intensity light. To get the desired effect a scientist uses a laser with power P = 0.0015 W to reach an intensity of I = 350 W/cm2 by focusing it through a lens of focal length f = 0.15 m. The beam has a radius of r = 0.0011 m when it enters the lens.Randomized VariablesP = 0.0015 WI = 350 W/cm2f = 0.15 mr = 0.0011 m Part (a) Express the radius of the beam, rp, at the point where it reaches the desired intensity in terms of the given quantities. (In other words, what radius does the beam have to have after passing through the lens in order to have the desired intensity?) Part (b) Give an expression for the tangent of the angle that the edge of the beam exits the lens with with respect to the normal to the lens surface, in terms of r and f? Part (c) Express the distance, D, between the lens's focal point and the illuminated object using tan(α) and rp. Part (d) Find the distance, D, in centimeters.arrow_forward
- Chapter 33, Problem 003 Z Your answer is partially correct. Try again. From the figure, approximate the (a) smaller and (b) larger wavelength at which the eye of a standard observer has half the eye's maximum sensitivity. What are the (c) wavelength, (d) frequency, and (e) period of the light at which the eye is the most sensitive? 100 80 60 40 20 400 450 500 550 600 650 700 Wavelength (nm) (a) Numbel o Units T510 Inm (b) Number Units Tnm 1610 (c) Numbel T550 Units Thm (d) Numbel545454550000000 Units THZ (e) Number Units p.00183 Relative sensitivityarrow_forwardChapter 33, Problem 003 Z Your answer is partially correct. Try again. From the figure, approximate the (a) smaller and (b) larger wavelength at which the eye of a standard observer has half the eye's maximum sensitivity. What are the (c) wavelength, (d) frequency, and (e) period of the light at which the eye is the most sensitive? 100 80 60 40 20 400 450 500 550 600 650 700 Wavelength (nm) (a) Numbel510 Units Inm (b) Numbel T610 Units Inm (c) Numbel T550 Units Inm (d) Number 5.45 Units (e) Number [27.75 Units Reative sensitivityarrow_forward1) Light travels in water at a speed of 2.25 × 108 m/s. Can a particle move faster than 2.25 × 10° m/s in water? 2) Are there particles that can move at the speed of ligh? mc2 According to Equation E what properties should these c2 particles have?arrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning