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Chapter 1: Q21P (page 9)
Question:Earth has a mass of . The average mass of the atoms that make up Earth is 40 u. How many atoms are there in Earth?
Answer
The number of atoms in Earth is .
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Two long, parallel copper wires of diameter 2.5 mmcarry currents of 10Ain opposite directions. (a) Assuming that their central axes are 20 mmapart, calculate the magnetic flux per meter of wire that exists in the space between those axes. (b) What percentage of this flux lies inside the wires? (c) Repeat part (a) for parallel currents.
Light of wavelength 121.6 nm is emitted by a hydrogen atom. What are the (a) higher quantum number and (b) lower quantum number of the transition producing this emission? (c) What is the series that includes the transition?
During heavy rain, a section of a mountainside measuring 2.5 km horizontally, 0.80 km up along the slope, and 2.0 m deep slips into a valley in a mud slide. Assume that the mud ends up uniformly distributed over a surface area of the valley measuring 0.40 km 脳 0.40 km and that mud has a density of. What is the mass of the mud sitting above a 4.0 m2 area of the valley floor?
Until 1883, every city and town in the United States kept its own local time. Today, travelers reset their watches only when the time change equals 1.0 h. How far, on the average, must you travel in degrees of longitude between the time-zone boundaries at which your watch must be reset by 1.0 h? (Hint: Earth rotates 360掳 in about 24 h.)
Question: Figure shoes four isotropic point sources of sound that are uniformly spaced on an x axis. The sources emit sound at the same wavelength and same amplitude and they emit in phase. A point, is shown on the y axis. Assume that as the sound waves travel to, the decrease in their amplitude is negligible. What multiple of toP if distance din the figure is
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