Which of the following is not a characteristic of the 11-year sunspot cycle?
A) The sunspot cycle is very steady, so that each 11-year cycle is nearly identical to every other 11-year cycle.
B) The likelihood of seeing solar prominences or solar flares is higher when sunspots are more common and lower when they are less common.
C) The Sun's entire magnetic field flip-flops at the end of each cycle (at solar minimum).
D) The number of sunspots on the Sun at any one time gradually rises and falls, with an average of 11 years between the times when sunspots are most numerous.
A
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Energy Levels: The wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the n = 2 state to the ground state is closest to which of the following values? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 122 nm B. 203 nm C. 243 nm D. 389 nm E. 411 nm
The solar cycle is a result of the
A. nuclear fusion at the core of the Sun. B. motion in the convection zone cycling material into the Sun's core. C. loss of energy in the Sun's magnetic field through flares, sunspots, and prominences. D. differential rotation of the Sun.
A motor with a coil resistance of 12.4 ? is attached to a voltage supply of 66.4 V. What is the current in the motor when it is running at its maximum speed with a back emf of 22.6 V?
a. zero b. 3.53 A c. 7.18 A d. 5.35 A e. 543 A
A 2.00-kg ball has zero potential and kinetic energy. Maria drops the ball into a 20.0-m deep well. After the ball comes to a stop in the mud, the sum of its potential and kinetic energy is:
a. 392 J. c. 784 J. b. -392 J. d. zero.