How can we measure the strength of magnetic fields on the Sun?
A) by looking for the splitting of spectral lines in the Sun's spectrum
B) by observing the sizes of sunspots: Bigger sunspots mean a stronger field
C) by observing auroras here on Earth
D) only by using sophisticated computer models, because there are no observational ways of measuring magnetic field strength
A
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Estimate the solid angle from area A1, subtended by area A2 as shown, as area A1 moves from position i to position ii to position iii. That is, determine ?12,i , ?12,ii , and ?12,iii .
Two identical blocks of iron are placed in contact, one at 10°C and the other at 20°C. If the cooler block cools to 5°C and the warmer block warms to 25°C, this would violate the
A) first law of thermodynamics. B) second law of thermodynamics. C) third law of thermodynamics. D) none of the above
A wall consists of 2 layers of material: brick in front of an equal thickness of wood. If the respective thermal conductivities of the brick and wood are 1.3 J/m-s-C and 0.15 J/m-s-C,
how does the temperature gradient across the wood compare to the gradient across the brick?
A galvanometer calibrated to read current is
A) an ammeter. B) a voltmeter. C) an ohm meter. D) none of the above