Electric field between two points Estimate the average magnitude of the Electric

Question

Electric field between two points Estimate the average magnitude of the Electric field between "B" & "C", given that the distance between B and C is 25.0 m. a. 1 V/m b. 2 N/C c. 3 V/m d. 4 N/C e. 5 Tesla Resonant cavity for sound The alum musician in "Star Wars" a playing an instrument that can be modeled as an open-open cavity. If the performer made its instrument with a 3D printer just before the performance, and designed it to have a fundamental frequency of 110Hz: noting that the speed of sound in the bar where it would be performing was 343 m/s, then how long did the resonant cavity need to be? a) 0.78 m b) 1.56 m c) 3.12 m d) 6.00 m e) None of the above Time constant and radioactive decay (SPECT scans) Single Photon Emission Computed Tomography (SPECT): Small quantities of a radioactive isotope are injected into a patient's arteries. The decay of the unstable nucleus emits gamma rays which are detected by SPECT imaging instruments to provide three-dimensional (tomographic) images of the distribution of these radioactive tracer molecules in the patient's body. The 3D images are computer generated from a large number of projection images of the body recorded at different angles. The cameras are mounted on a relating gantry that allows the detectors to be moved in a light circle around a patient who is lying motionless on a pallet. The metastable state of Technetium-99 (^99 m Tc, mass = 98.9AMU, t_1/2 = 360.35 min) is the most commonly used medical dioisotope. What is the radioactive decay time constant (tau) of ^99m Tc? a. 108 min b. 249.7 min c. 520 min d. 1197 min e. None of the above

Explanation / Answer

As electric field is given by change of potential with respect to length with negative sign.

So,

E=-dv/dl=-(Vc-Vb)/L=-(50-0)/25=2 N/C

Hence option (b) is correct.

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