What is the de Broglie wavelength of a ball of mass 200 g moving at 30 m/s? (h = 6.626 × 10-34 J ? s)
A) 1.1 × 10-34 m
B) 2.2 × 10-34 m
C) 4.5 × 10-28 m
D) 6.7 × 10-27 m
A
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Size of the Nucleus: Calculate the estimated density of the nucleus of 
Sr? (mneutron ? mproton = 1.67 × 10-27 kg)
A. greater than 3.0 × 1020 kg/m3 B. 90 kg/m3 C. 2.1 × 1019 kg/m3 D. 2.0 × 1015 kg/m3 E. 2.3 × 1017 kg/m3
If the net force on a cart is tripled, the cart's acceleration
A) is one third. B) is two thirds. C) is three times as much. D) is more than three times as much.
Which of the following statements best reflects our current knowledge about the term flife in the equation
Number of Civilizations = NHP × flife × fcivilization × fnow? A) The value of flife is equal to 1/2. B) The value of flife is greater than 10. C) The value of flife is between 0 and 1. D) The value of flife is either 0 or 1. E) The value of flife is less than 0.0000001.
A series circuit contains an 80-?F capacitor, a 0.020-H inductor, and a switch. The resistance of the circuit is negligible. Initially, the switch is open, the capacitor voltage is 50 V, and the current in the inductor is zero
At time t = 0 s, the switch is closed. When the current in the circuit is 1.5 A, what is the charge on the capacitor? A) 2000 µC B) 2500 µC C) 3000 µC D) 3500 µC E) 4000 µC