What is a gravitational lens?
A. a lens that is affected by gravity
B. a massive object that bends the space around it, causing light passing it to bend
C. a star that is eclipsed by one of its planets
D. an extremely massive refractor telescope
Answer: B
You might also like to view...
If the plane of the Earth's equator were not tilted with respect to the ecliptic plane,
a. the daylight period of Earth would be the same year-round. b. there would be no seasonal changes. c. Earth's poles would not experience six-month-long nights. d. All of the above.
An air-filled capacitor is formed from two long conducting cylindrical shells that are coaxial and have radii of 13 mm and 85 mm
The electric potential of the inner conductor with respect to the outer conductor is -600 V. (k = 1/4??0 = 8.99 × 109 N • m2/C2 ) The maximum energy density of the capacitor is closest to A) 2.7 × 10-3 J/m3. B) 1.3 × 10-3 J/m3. C) 6.7 × 10-4 J/m3. D) 3.4 × 10-3 J/m3. E) 1.7 × 10-4 J/m3.
Identical point charges Q are placed at each of the four corners of a 3.0 m × 4.0 m rectangle. If Q = 40 ?C, what is the magnitude of the electrostatic force on any one of the charges?
a. 3.0 N b. 2.4 N c. 1.8 N d. 3.7 N e. 2.0 N
If a radio wave has speed 3.00 × 10^8 m/s and frequency 99.7 MHz, what is its wavelength?
a. 8.78 m c. 2.78 m b. 1.50 m d. 3.01 m