What is the wavelength of the photon emitted when a hydrogen atom which is in the initial state n = 8 transitions to the final state n = 2? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 205 nm
B) 104 nm
C) 389 nm
D) 486 nm
E) 610 nm
C
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Almost half of all known millisecond pulsars are found in what type of object?
A) giant molecular clouds B) open clusters C) globular clusters D) emission nebulae E) supernova remnants
What mechanism explains the presence of "hot Jupiters" around many other stars?
A) evaporation of the disk by the stellar wind removes gas that was holding the planet at a large radius B) gravitational attraction by terrestrial planets that formed at small radii attract the giant planets inward C) rapid formation of the gas giant from evaporated rock and metal at the inner disk edge D) planetary migration caused by gravitational interactions between the planet and disk
The Great Wall is a huge sheet of galaxies that stretches for over 100 Mpc
Indicate whether the statement is true or false
By operating a reversible heat engine with an ideal gas as the working substance in a Carnot cycle and measuring the ratio Qc /Qh, we can calculate
a. n, the number of moles of the ideal gas. b. the ratio Vc /Vh of the volumes of the ideal gas. c. the ratio Pc /Ph of the pressures of the ideal gas. d. the ratio PcVc /PhVh of the products of volumes and pressures of the ideal gas. e. the value of Avogadro's number.