Listed following are distinguishing characteristics and examples of reflecting and refracting telescopes. Match these to the appropriate category.
Ans:
Reflecting telescopes
Most commonly used by professional astronomers todayThe Hubble Space Telescope world's largest telescope
Refracting telescopes
The world's largest is 1-meter in diameter very large telescopes become "top-heavy"incoming light passes through glassGalileo's telescopes
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Torque: A rigid rectangular loop, measuring 0.30 m by 0.40 m, carries a current of 5.5 A, as shown in the figure. A uniform external magnetic field of magnitude 2.9 T in the -x direction is present. Segment CD is in the xz-plane and forms a 35° angle with the z-axis, as shown. What is the magnitude of the torque that the magnetic field exerts on the loop?
A. 1.1 N ? m B. 0.73 N ? m C. 1.3 N ? m D. 1.4 N ? m E. 1.6 N ? m
Which statement about the cosmic microwave background is not true?
A) It is the result of a mixture of radiation from many independent sources, such as stars and galaxies. B) Its spectrum corresponds to a temperature of just under 3 degrees above absolute zero. C) It is thought to be radiation that began its journey to our telescopes when the universe was about 380,000 years old. D) With the exception of very small variations, it appears essentially the same in all directions in which we look into space.
Ultrasonic sound that travels at 1530 m/s in ocean water is bounced off the ocean floor and returns to the ship above. If the round trip takes 3 s, the depth of the water is
A) 1530 m. B) 2295 m. C) 3060 m. D) 4590 m.
The radius of a star is 6.95 × 108 m, and its rate of radiation has been measured to be 5.32 × 1026 W. Assuming that it is a perfect emitter, what is the temperature of the surface of this star? (? = 5.67 × 10-8 W/m2 ? K4 )
A) 6.27 × 103 K B) 8.25 × 103 K C) 5.78 × 107 K D) 3.93 × 107 K E) 8.87 × 103 K