Why is the absorption spectrum of atomic hydrogen different from that of helium?
A. There is usually more hydrogen than helium in stars.
B. Hydrogen atoms have a lower mass, and are therefore faster.
C. The energy differences between orbitals in hydrogen are different from those in helium.
D. Helium has more neutrons than hydrogen.
Answer: C
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The figure shows the position of an object (moving along a straight line) as a function of time. Assume two significant figures in each number. Which of the following statements about this object is true over the interval shown?
A) The object is accelerating to the left. B) The object is accelerating to the right. C) The acceleration of the object is in the same direction as its velocity. D) The average speed of the object is 1.0 m/s.
What type of faulting results from expansive stresses?
a. Reverse b. Normal c. Strike-slip d. Abnormal
If both 30-GeV electrons and 30-GeV protons are used to probe the nucleus, which has the shorter wavelength?
A) They are the same. B) the electrons C) the protons D) It depends on the nucleus probed. E) They are never the same.
Some properties of glass are listed here
Density: 2300 kg/m3 Specific heat: 840 J/kg ? °C Coefficient of linear thermal expansion: 8.5 × 10-6 (°C)-1 Thermal conductivity: 0.80 W/(m · °C) A glass window pane is 2.7 m high, 2.4 m wide, and 2.0 mm thick. The temperature at the inner surface of the glass is and at the outer surface 4.0°C. How much heat is lost each hour through the window under steady state conditions? A) 1.7 × 108 J B) 1.7 × 105 J C) 4.7 × 104 J D) 4.7 × 101 J E) 1.7 × 106 J