The flux through a coil changes from 4 × 10-5 Wb to 5 × 10-5 Wb in 0.1 s. What emf is induced in this coil?
A) 5 × 10-4 V
B) 1 × 10-4 V
C) 4 × 10-4 V
D) 3 × 10-4 V
E) 7 × 10-4 V
B
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How fast must a hydrogen atom be traveling for its kinetic energy to be just enough to excite the ground-state atom to its first excited state in a collision? (1 eV = 1.60 × 10-19 J, mH ? mproton = 1.67 × 10-27 kg)
A) 44.2 km/s B) 21.7 km/s C) 66.5 km/s D) 113 km/s E) 51.0 km/s
What basic thermodynamic law applies to Question 5?
A waxing crescent Moon is visible
a. near the eastern horizon just before sunrise. b. near the eastern horizon just after sunset. c. near the western horizon just before sunrise. d. near the western horizon just after sunset. e. from sunset until sunrise.
You are heating two chunks of metal of the same size and shape. One is made of lead and is heated to 400 K. The other is made of iron and is heated to 350 K. Which of the following statements apply to the thermal radiation the two chunks emit?
A) The two spectra peak at the same wavelength. B) The spectra cannot be compared because they come from different materials. C) The lead spectrum peak is at a shorter wavelength than the iron spectrum peak. D) The lead spectrum peak is at a longer wavelength than the iron spectrum peak.