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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_forwardhelp me please, this is my review for my exam tomorrowarrow_forwardThe 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_forward
- An experimenter stands along a line between two firecrackers that are 1500 m apart. The two firecrackers explode simultaneously. She sees the flash of the light from the firecracker to her left 1.0 μs before she sees the flash from the firecracker to her right. Where is the experimenter standing?arrow_forwardQ1(A). Prove using step-by-step solution that f(v) = E/h is equal to 1.80x1015 Hz, therefore λ = C/f is equal to 254nm. Q1(B). Refer to the visible light spectrum to determine what region of EM radiation does this light fall? Q1(C). Show step-by step solution to integrate the velocity function if the initial position of the particle is s(0) = 9. Find the particle position at: (1) t = 1 sec ; (2) t = 5 secarrow_forwardG till fore A Attend AP2 Eng A ADD YO E Eunice A Therm = S2 1st E S2 1st ns/d/e/1FAlpQLSeVsn6Eg6Fw-LiQ5q5KinLzOnycwscjWN0wZgqJ8USbzhJWnA/viewform?hr_submissic | eunice b. A Classes SIS Grades and Attenda.. My Drive - Google D. Google Docs O DCCCD 500 N•s 1000 N•s How much heat is transferred to a 0.1 kg silver chain from the human body if it was at 25°C and now its at body temperature(37°C) * 282.1 J 399.5 J O 139.8 J 1339.5 J Determine if the collisibn case is an elastic or inelastic collision: a rider jumps on a horse and runs away on it * Elastic Inelastic |器 EXUarrow_forward
- A 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_forwardConsider 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_forward
- Mr. Hadi sent an email using 01 Gbps network bandwidth which contained a message size of 2.5-KB (Kilobyte) . Mr. John is X km away from sender (where X =172) who received email at speed of light travels at 2.4 × 108 m/s. You may need to calculate propagation time and the transmission time for the entire communication, and also discuss the dominant factor in this communication. Draw the figure by labelling all above mentioned values and add screen shot in your answer along with your solution.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
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning