If the radiant energy from the Sun comes in as a plane EM wave of intensity 1340 W/m2, calculate the peak values of E and B
a. 300 V/m, 10?4 T
b. 1000 V/m, 3.35 × 10^?6 T
c. 225 V/m, 1.60× 10?3 T
d. 111 V/m, 3.00 × 10^?5 T
e. 711 V/m, 2.37 × 10^?6 T
b
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In a given reversible process, the temperature of an ideal gas is kept constant as the gas is compressed to a smaller volume. Which one of the following statements about the gas is correct?
A) The gas must absorb heat from its surroundings. B) The gas must release heat to its surroundings. C) The pressure of the gas also stays constant. D) The process is adiabatic. E) It is impossible to predict on the basis of this data.
Estimate the time required to heat the center of a 1.5-kg roast in a 163°C oven to 77°C. State your assumptions carefully and compare your results with cooking instructions in a standard cookbook.
GIVEN
FIND
The time required to heat the roast
ASSUMPTIONS
SKETCH
If a piece of ribbon were tied to a stretched string carrying a transverse wave, how would the ribbon be observed to oscillate?
a. Perpendicular to the wave motion b. Parallel to the wave motion c. Neither (A) nor (B) d. Both (A) and (B)
Supernova remnants ________.
A. may contain up to 10 solar masses of material ejected from the star B. initially expand at thousands of km/s C. are important for mixing material into the interstellar medium D. All of these choices are correct.