A helium-neon laser emits red light having a wavelength of 632.8 nm and a power of 10 mW. How many photons are emitted each second? (h = 6.63 × 10^-34 J×s, c = 3.00 × 10^8 m/s, and 1 nm = 10-9 m)
a. 4.8 × 10^17
c. 3.2 × 10^16
b. 1.6 × 10^15
d. 2.6 × 10^18
C
Physics & Space Science
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Conversion of Units: There are 640 acres in a square mile, 5280 ft in one mile, and 3.28 ft in one meter. How many acres are there in a hectare, which is a square one hundred meters on each side?
Fill in the blank(s) with the appropriate word(s).
Physics & Space Science
The surface of Venus is dominated by ________.
A. recent lava flows B. scarps C. large canyons D. impact craters E. oceans of sulfuric acid
Physics & Space Science
The planet in our solar system with the highest average surface temperature is
A) Venus B) Mercury C) Earth D) Neptune
Physics & Space Science
Which of the following is NOT a moon of Jupiter?
A) Ganymede B) Callisto C) Titan D) Io
Physics & Space Science