If the energy of n = 4 is –0.85 eV and that of n = 2 is –3.40 eV in a hydrogen atom, a transition from n = 4 to n = 2 will release a photon of what energy?
2.55 eV (-0.85 eV + 3.40 eV)
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In the vicinity of what frequency does an object with a temperature of 1000 K radiate the largest amount of power? (c = 3.00 × 108 m/s, Wien displacement law constant equals 2.90 × 10-3 m ? K, ? = 5.670 × 10-8 W/m2 ? K4)
A) 1.0 × 1014 Hz B) 8.0 × 1014 Hz C) 2.3 × 1014 Hz D) 6.7 × 1014 Hz E) 4.1 × 1014 Hz
What is an astronomical unit?
A) the average speed of Earth around the Sun B) the length of time it takes Earth to revolve around the Sun C) the average distance from Earth to the Sun D) the diameter of Earth's orbit around the Sun E) any basic unit used in astronomy
A certain crystal has a spacing of 0.442 nm between atoms. A beam of neutrons moving with a speed of 1640 m/s perpendicular to the surface is diffracted as it passes through the crystal
What is the angle from the central maximum to the next interference maximum? (mneutron = 1.675 × 10-27 kg, h = 6.626 × 10-34 J ? s) A) 17.0° B) 21.0° C) 33.1° D) 60.0° E) 90.0°
Alcohol is less dense than water. If alcohol is used to make a barometer at normal atmospheric pressure, the height of the alcohol column would be
A) less than 10.3 m. B) 10.3 m. C) more than 10.3 m.