The objective and the eyepiece of a refracting astronomical telescope have focal lengths of 320 cm and 4.0 cm, respectively. The telescope is used to view Neptune and the final image is set at infinity. The diameter of Neptune is 4
96 × 107 m and the distance from the earth at the time of observation is 4.4 × 1012 m. What is the angle (in mrad) subtended by the final telescopic image of Neptune? A) 0.90 mrad
B) 1.1 mrad
C) 1.3 mrad
D) 1.5 mrad
E) 1.7 mrad
A
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A cluster containing a thousand or more galaxies, usually mostly ellipticals, scattered over a volume only a few Mpc in diameter is referred to as a(n) _____
A) elliptical galaxy cluster B) irregular galaxy cluster C) poor galaxy cluster D) rich galaxy cluster
At every instant the ratio of the magnitude of the electric to the magnetic field in an electromagnetic wave in vacuum is equal to
A. the speed of radio waves. B. the speed of light. C. the speed of gamma rays. D. all of the above. E. only (a) and (b) above.
Answer the following statement(s) true (T) or false (F)
Consider an infinite solenoid with a rectangular cross section instead of a circular cross section. 1. The solenoid’s magnetic field must everywhere still point parallel to the solenoid’s central axis. 2. The solenoid’s magnetic field must still be zero everywhere outside the solenoid. 3. The solenoid’s magnetic field in the solenoid’s hollow interior must still have a uniform magnitude ? 0 (NI/L), where N is the number of turns in length L and I is the current carried by each turn
Bright and dark fringes are seen on a screen when light from a single source reaches two narrow slits a short distance apart. The locations of bright and dark fringes can be interchanged if a thin film is placed in front of one of the slits. The minimum width of this film must be
A.
.B.
.C.
.D.
.E.
.