number 2 In the Bohr model of the hydrogen atom, an electron in the lowest energ
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number 2
In the Bohr model of the hydrogen atom, an electron in the lowest energy at a speed of 2.19 times 10^6 in/s in a circular path having a radius of 5.29 times 10^11 m (the 'Bohr radius"). What is the effective current associated with this orbiting electron? (This is a standard problem that happens to be # 3 in your textbook. Make that circular path a "unnr" and ask hour much charge passes a point in that untr each second.) So many of you are wimps! The maximum charge that our classroom Van de C.raaff generator could hold on its dome was about 5 ftC. Assume t hat when you get shocked by the generator, all of this charge passes through you in just one-hundredth of a second (1.00 times 10^-2 s). (a) Calculate the associated current for getting shocked by the Van de Graaff generator, and express your answer in units of mA (miHi-amperes). Now, let's say you are feeling bold and opt to lick a 9 V battery. The resistance for wet skin Ls about 2000 U. (b) Calculate the associated current through your tongue when you place it across the terminals of a 9 V battery, and express your answer in the same units of mA. A power line carries a current of 1.25 times 10^3 A over a distance of 1.00 times 10^3 km. The line Ls made of copper (Copper: Cu. atomic weight 63.5, density of 8.920 g/cm^5, assumed to have one free electron per every copper atom) and has a diameter of 2.00 cm. How long does it take jui individual electron to trawl the entire length of the power line? Clear! A defibrillator uses a 150 muF capacitor charged to a potcntial difference of 1000 V'. If all the charge on the capacitor Ls delivered to the patient during a time interval of 5.0 times 10^-2 s. determine the resistance associated through the patient's chest. Clouseau is at it again. This time, he has found a small piece of inetal at the crime scene where the Pink Panther was stolen. The metal is rectangular, with a length of 4.0 cm and a square cross section of area equal to 2.50 times 10^-5 in^2. He attaches the two square ends to a 1.5 V Ixatterv and uses an anunetcr to measure the resulting current through tin* metal. finding it to be 3.82 times 10^4 A. Based on the implied resistivity, what Ls the identity of this mysterious material? (Table 17.1 of your text will In helpful, and Inspector Clouseau s lab is assumed to be at the reference temperature of 20degree C.) Those cute little LED flashlights frequently are powered by 3 AAA lotteries connected in series so the net voltage is 4.5 V. The letter alkaline batteries provide a lifetime of about 1.20 Ah (ampere hours). If the net resistance of the bulb assembly in the flashlight Ls 1.50 times 10^2 il, how long can such a flashlight be turned on before requiring now batteries? A Tungsten filament for a light bulb is found to haw a resistance of 0.25 ohm when measured at a temperature of 20degree C. When the light bulb has been on for a substantial ixriod of time, the filament has heated up and the resistance is found to be 3.50 12 What is the temperature of the heated filament? Tungsten s temperature coefficient of resistivity is 4.5 times 10^3 per degree C, and do not consider thermal expansion of the hlamcnt.Explanation / Answer
a) associated current I=cuurrent passed through a point/time=(5x10^-6)/(1x10^-2)= 5 x10^-4 amp
b)associated current through the tounge= (9/2000)=4.5x 10^-3 amp
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