Star A has an apparent visual magnitude of 13.4 and star B has an apparent visual magnitude of 15.4 . Star A is ____ than star B
a. 2 times fainter
b. 2 times brighter
c. 6.3 times fainter
d. 6.3 times brighter
e. 29.8 times fainter
D
You might also like to view...
A person's face is 30 cm in front of a concave shaving mirror. If the image is an erect image 1.5 times as large as the object, what is the mirror's focal length?
A) 20 cm B) 30 cm C) 50 cm D) 70 cm E) 90 cm
An electron moving perpendicular to a uniform magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving? (mel = 9.11 × 10-31 kg. e = 1.60 × 10-19 C)
A) 2.2 × 107 m/s B) 1.9 × 10-2 m/s C) 1.9 × 10-30 m/s D) 3.0 × 106 m/s E) 8.0 × 106 m/s
An 80-g particle moving with an initial speed of 50 m/s in the positive x direction strikes and sticks to a 60-g particle moving 50 m/s in the positive y direction. How much kinetic energy is lost in this collision?
a. 96 J b. 89 J c. 175 J d. 86 J e. 110 J
The two strongest forces that act between protons in a nucleus are
A) the weak nuclear and electromagnetic forces. B) the weak nuclear and the gravitational forces. C) the electrostatic and the gravitational forces. D) the strong nuclear and the electrostatic forces.