In a ruby laser, an electron jumps from a higher energy level to a lower one
If the energy difference between the two levels is 1.8 eV, what is the wavelength of the emitted photon?
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 350 nm
B) 470 nm
C) 650 nm
D) 690 nm
E) 960 nm
D
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We observe a planet crossing in front of its host star and the planet is smaller than the star. We call this crossing motion a ____________
Fill in the blank(s) with correct word
The significant result of the Michelson-Morley experiment was that it found
a. the ether moved with the Sun. b. the ether moved with the Earth. c. the speed of the ether wind was greater than expected. d. no effect.
A pipe of length 10.0 m increases in length by 2.0 cm when its temperature is increased by 90°F. What is its coefficient of linear expansion?
a. 22 × 10^–6/°C c. 13 × 10^–6/°C b. 17 × 10^–6/°C d. 40 × 10^–6/°C
Compared to the volume of its nucleus, the volume of an atom is about
A) the same. B) a thousand times greater. C) a million times greater. D) a billion times greater. E) a trillion times greater.