Question 12 (1 points) Electromagnetic radiation from a 4.25mW laser is concentrated on a 397 1111112 maximum electric force it experiences? area. Suppose a 1.08 nC electric charge is in the beams What is the Please enter a numerical answer below. Accepted formats are numbers or e based scientific notation e.g. 0.23, *2, 'le6, 5.2338 Enter answer here X 10'6 N Question 13 (1 point What is the maximum electric field strength in an electromagnetic wave that has a maximum magnetic field strength of 8.11 X 10'4 T (about 10 times the Earth's)? Please enter a numerical answer below. Accepted formats are numbers or e based scientific notation eg. 0.23, -2, 166, 5.23e-8 Enter answer here kV/m Question 14 (1 points: Lasers can be constructed that produce an extremely high intensity electromagnetic wave for a brief timecalled pulsed lasers. They are used to ignite nuclear fusion, for example. Such a laser may produce an electromagnetic wave with a maximum electric eld strength of 2.61 X 1011 V/m for a time of 1.00 ns. What energy does it deliver on a 1.00 mm2 area? Please enter a numerical answer below. Accepted formats are numbers or e based scientific notation e.g. 0.23, *2, ie6, 5.2368 Enter answer here kJ Question 15 (1 points) What is the intensity of an electromagnetic wave with a peak electric eld strength of 252 V/m? Please enter a numerical answer below. Accepted formats are numbers or e based scientific notation e.g. 0.23, *2, 186, 5.23e78 Enter answer here W/m2 Question 16 (1 points: Assume the helium-neon lasers commonly used in student physics laboratories have power outputs of 0388 mW, If such a laser beam is projected onto a circular spot 1.00 mm in diameter. nd the peak magnetic field strength. Please enter a numerical answer below. Accepted formats are numbers or \"e" based scientific notation eg. 0.23, -2, 1e6, 5.23e-8 Enter answer here MT Question 17 (1 points: Suppose the maximum safe intensity of microwaves for human exposure is taken to be 1.45 W/mz. If a radar unit leaks 10.0 W of microwaves (other than those sent by its antenna) uniformly in all directions, how far away must you be to be exposed to an intensity considered to be safe? Assume that the power spreads uniformly over the area of a sphere with no complications from absorption or reection. (Note that early radar units leaked more than modern ones do. This caused identiable health problems, such as cataracts, for people who worked near them.) Please enter a numerical answer below. Accepted formats are numbers or e based scientific notation e.g. 0.23, 21:96, 5.23e78 Enter answer here cm Question 18 An electromagnetic wave has a frequency of 12 MHZ. What is its wavelength in vacuum? Please enter a numerical answer below. Accepted formats are numbers or e based scientific notation e.g. 0.23, *2, le6, 5.2368 Enter answer here Question 19 (1 points) Some radar systems detect the size and shape of objects such as aircraft and geological terrain. The size of the smallest observable detail (i.e.m the resolution of the system) is approximately equal to the wavelength of the electromagnetic wave used' Approximately what is the smallest observable detail utilizing 411-MHz radar? Please enter a numerical answer below. Accepted formats are numbers or "e\" based scientific notation e.g. 0.23, *2, ie6, 5.23e78 Enter answer here m Question 20 (1 point The ideal size (most efcient) for a broadcast antenna with one end on the ground is onefourth the wavelength (/\\/4) of the electromagnetic radiation being sent out. If a new radio station has such an antenna that is 24.0 m high, what frequency does it broadcast most efciently? Please enter a numerical answer below. Accepted formats are numbers or \"6" based scientific notation e.g. 0.23, *2, 196, 5.2338 Enter answer here MHZ