What is "uncertain" in the Heisenberg Uncertainty principle?
A. The energy of the particle when it has wave properties
B. The exact number of protons in the nucleus
C. The value of the particle's position when the particle's momentum is known precisely
D. The value of the Planck's constant
E. The time period of the wave describing the particle
Answer: C
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Spectral Series: What is the shortest wavelength of the Lyman series?
A. 91.16 nm B. 45.60 nm C. 121.5 nm D. 204.1 nm E. 365 nm
If the interplanar spacing of NaCl is 2.814 × 10?10 m, what is the predicted angle at which X-rays of wavelength 0.140 nm will be diffracted in a first-order maximum?
A. 31.3° B. 7.20° C. 20.5° D. 14.4° E. 29.8°
Power: A battery supplies 6.0 mA to a 12-? resistor for 1.5 h. How much electric energy does this resistor dissipate in this time?
Fill in the blank(s) with the appropriate word(s).
A battery with an emf of 12.0 V has a terminal voltage of 11.25 V when the current is 3.15 A. What is the load resistance, R?
a. 0.238 ? b. 2.34 ? c. 3.57 ? d. 7.38 ?