As its name implies, the ________ star has fused its protons and electrons
Fill in the blank(s) with correct word
neutron
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A laser emits light of wavelength 463 nm during a brief pulse that lasts for 25 ms and has a total energy of 1.2 J. How many photons are emitted in that single pulse? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J • s)
A) 2.8 × 1018 B) 6.9 × 1019 C) 3.4 × 1019 D) 1.1 × 1017 E) 2.2 × 1017
Three point charges are positioned on the x axis. If the charges and corresponding positions are +32 ?C at x = 0, +20 ?C at x = 40 cm, and ?60 ?C at x = 60 cm, what is the magnitude of the electrostatic force on the +32-?C charge?
a. 84 N b. 12 N c. 36 N d. 50 N e. 48 N
When waves from a pair of closely-spaced slits arrive out of phase
A) a bright fringe is produced. B) a dark fringe is produced. C) both bright and dark fringes are produced. D) none of the above
Sunspots are ________ poles in the photosphere
Fill in the blank(s) with correct word