Water at 4°C will contract when it is slightly
A) cooled.
B) warmed.
C) both of these
D) none of the above
Answer: D
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As seen from the Earth's southern hemisphere, the celestial equator passes
a. north of overhead. b. south of overhead. c. through the north celestial pole. d. through the south celestial pole.
Of the following states, 5s, 3p, 4f, 5p, 4g, 3d, and 2p, the one which is NOT allowed is
a. 3p b. 4f c. 3d d. 4g e. 2p
A doubly-ionized lithium atom Li++, which has 3 protons, undergoes a transition from the n = 5 state to the n = 4 state
What is the wavelength of the photon which is emitted during this transition? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 650 nm B) 550 nm C) 450 nm D) 350 nm E) 750 nm
A coil of wire containing N turns is in an external magnetic field that is perpendicular to the plane of the coil and it steadily changing. Under these circumstances, an emf ? is induced in the coil
If the rate of change of the magnetic field and the number of turns in the coil are now doubled (but nothing else changes), what will be the induced emf in the coil? A) 2? B) ?/2 C) 4? D) ?/4 E) ?