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- A portable chest radiograph is obtained on a recumbent patient using 86kVp and 1.6 mAs, @ 44” SID. You are asked to repeat the exposure with the patient in an erect position. If you are able to obtain an SID of 68”, what new technique would be required? 4. An acceptable image was created using 75kVP 22mAs at 40”SID on a patient with a broken hip. A traction device was installed on the bed and a follow up image was ordered. The Traction bar required made it impossible to obtain a 40”SID. A 60” SID must be used, what mAs should be used to compensate for the SID change?A photon has an energy of 1.9 meV (milli electron Volt). What is the wavelength of this photon, expressed in micrometers? Keep four significant digits.Q1.A) If an 8-bit SAR ADC is used to digitize 8V full scale signal, what will be the digital o/p for an analog i/p of 5.76 V (perform complete analysis)? Q1.B) Explain why active filters are designed as biquadratic sections ?
- A 192ir (r= 0.462 R. m2/Ci. h) source of strength 20 GBq is present as a wire of %3D length 3 m. What is the exposure rate, in R/h, 4 m away from this source if a person is standing: A)1 m from the left end of the source?( 4 m 1 m 2 m B) Directly in the center of the 3 m length? 4 m 1.5 m 1.5 mFind the range in wavelengths (in vacuum) for visible light in the frequency range between 4x1014 Hz (red light) and 7.9 x1014 Hz (violet light). Express the answers in nanometer. (1 nm = 10-9m)Line XY was measured by four parties A, B, C, D. Each party has two measurements as follows: Trial A B C D 1 91.25 91.21 91.20 91.18 2 91.19 91.27 91.22 91.26 a. Find the precision of each party and which has the highest precision. b. What is the most probable length of XY?
- Find the average and %error % error = |gtheoretical - gexperimental| ÷ gtheoretical x 100 % error = | 9.8 - ____| ÷ 9.8 x 100If T = 2pi(m/k)^1/2, and T’=2pi(m/2k)^1/2, what is T’ in terms of T?The x-ray linear attenuation coefficient of water at 40 keV is ?????? = 0.27 ??−1.The CT number of a tumor reported by a CT scanner is 60 HU. Calculate the linear attenuation coefficient of the tumor tissue ?