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1. [0/1 Points] DETAILS PREVIOUS ANSWERS WAUNIPHYSAV1 32.P.006. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER If the electric field emitted by a radio tower has an amplitude of 274 V/m, what is the amplitude of the corresponding magnetic field? 0.726 X How does the electric field of a planar wave relate to the magnetic field of a planar wave? T 2. [0/1 Points] DETAILS PREVIOUS ANSWERS WAUNIPHYSAV1 32.P.026. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A green laser pointer has a power output of 142 mW. (a) If the laser beam is projected onto a circular spot 3.75 mm in diameter, what is its intensity? 1.42 X What is the relationship between power and intensity? Are you given a radius or a diameter? W/m2 (b) Find the peak electric field strength. V/m (c) Find the peak magnetic field strength.3. [-/1 Points] DETAILS WAUNIPHYSAV1 32.P.031. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER You and your friend Hodges are conducting an experiment with light. Hodges points a light source at you and you measure the peak magnetic field value as B = 5.9 HT. (a) What is the maximum magnitude of the electric field? V/m (b) What is the maximum instantaneous power per unit area of the light at your location? w/m2 (c) What is the intensity (that is, time-averaged power per unit area) of the light at your location? w/m2 4. [-/1 Points] DETAILS WAUNIPHYSAV1 32.P.013. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER During the Cold War, American submarines operated as "lone wolves" at extreme ocean depths for many months at a time. Ordinary radio signals are greatly attenuated at such depths, making communication with the submarines difficult. One way suggested to communicate with the submarines was a program the Navy called Seafarer that used extremely low frequency waves. If the Seafarer transmitter broadcast at 92 Hz, what length would the transmitter's quarter wavelength antenna have to be in order to receive the signal? km5. [I1 Points] WAUNIPHYSAV1 32.P.020. ASK YOUR TEACHER In North America, broadcast channels are numbered 2 through 69, and each has an associated frequency range. What are the wavelength ranges for the following? (Give your answer to at least two decimal places.) (a) the VHF channel 2 (5460 MHz) :] m (largest value) :] m (smallest value) (b) the VHF channel 11 (198204 MHz) :] m (largest value) :I m (smallest value) 6. [0/1 Points] PREVIOUS ANSWERS WAUNIPHYSAV1 32.P.021. ASKYOUR TEACHER PRACTICE ANOTHER You have been taken to the emergency room. To get a constant update on your vital signs, equipment is attached to you, including a pulse oximeter. The pulse oximeter shines two LEDs on your nger to test how much oxygen is in your blood. One LED transmits in infrared (902 nm) and one transmits in visible red (660 nm). What are the frequencies of these LEDs? red x What is the relationship between wavelength and frequency? Hz infrared x What is the relationship between wavelength and frequency? Hz 1. [-/1 Points] WAUNIPHYSAV1 32.P.035. ASK YOUR TEACHER PRACTICE ANOTHER Radio waves from a source are incident on a at surface at normal incidence. If the surface absorbs 100% of the incident energy and experiences a pressure of 3.40 x 107 N/mz, what was the power per unit area of the incident waves? :wxmz