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- Experiments are performed with ultra-cold neutrons having velocities as small as 1.00 m/s. (a) What is the wavelength of such a neutron? (b) What is its kinetic energy in eV?X-rays are usually produced by making high-velocity electrons collide with metallic targets. For electrons accelerated in a field of 75,000 volts,a. compute the wavelength (in nm) of the x-rays producedb. if this same kinetic energy is transferred to a proton, how fast would the proton be traveling (in m/s)?What is the value of Bmeasured When I=o A ? State at least two reasons for that.
- Question 2 A center-fed dipole is excited by a current Io =9.3 A. If the dipole is 1.1 cm in length, determine the maximum radiated power density Smax of the E-M wave of frequency 490 MHz at a distance of 700 m. Answer to the 4th digit precision after the decimal place (eg. 1.2345). Smax -(μW/m²) Your Answer: Answer Question 3 An antenna with a radiation efficiency of 89.0% has a directivity of 6.0 dB. What is its gain G in decibels? Answer to the 4th digit precision after the decimal place (eg. 1.2345). G= Your Answer: Answer dB.How to find Repeatability Weight (w) (gram) V. Try (n) (V – AVG)² (Volt) 1 50 0.1 2 50 0.15 3 50 0.099 4 50 0.1 50 0.12 Calculate AVG Find SUM O = uns V n 20 * 100% R% OFRFind the phasor notation of: C(t) DE(t)/at, where E(t) = cos (wt + + 4 sin(wt) £ + [8 cos(wt) – sin(wt)]2.
- a. A dental x-ray machine has a 60 kV accelerating voltage and a tungsten target. Atypical exposure uses an 8.0 mA electron current for 18 s. What is the approximatepower of the x-ray emission? The conversion efficiency is not known precisely, so aone-significant-figure answer is appropriate. b. What is the x-ray intensity at the jaw, 15 cm from the source? Assume that the x raysare emitted uniformly in all directions from a single point. c. A molar tooth can be approximated as a 9-mm-diameter, 20-mm-long cylinder. X raysimpinge on a molar from the side, perpendicular to the axis of the cylinder. Approxi-mately what x-ray energy enters a molar during the exposure?Determine the time in seconds required to sputter 50 nm of Si using a 10 µA/cm2 beam of 45 keV ions of (a) Ne, (b) Kr, and (c) Хе.Drive The following equation for penetration Theory y (2VDI) Dt CACAO Cai - Cao = erfc = 1 - erf - (2VDI) Dt
- (11% Problem 15: Electromagnetic radiation having a wavelength of 17 um is classified as infrared Randomized Variables 17 um What is its frequency in hertz? Grade Summary Deductions Potential 09% 100% Submissions Attempts remaining (2% per attempt) detailed view tan sin) cotan atan cosO asin( acotan 7 8 HOME E 4 acos 5 6 sinh 1 2 3 cosh) tanh0 Degrees cotanh0 0 END Radians VOBACKSPACE CLEAR DE I give up! Submit Hint Feedback Hints: 0% deduction per hint. Hints remaining: 2 Feedback 0% deduction per feedback CO NQ1/ A CRT has an effective length of 4 Cm and distance between the plates of 3 mm. The screen has 45 Cm away from the center of plates. The electron beam enters the plates at velocity of 25 10 m/s. The deflection factor has 300 V/m. the intensity field is 3 KV/m. If the electron mass and charge are 9.1 10-31 Kg and 1.6 10-19 C. Determine- 1- The vertical deflection. (y). 2- The angular deflection. (o). 3- Find The coordinates of the point at which the election beam leaves the plates P (x, y). 4- Where should be the screen placed in order to obtain the deflection on the screen. (D-2cm). 5- What the time taken by the electron in its travel between entering the plates and reaching the screen.hd Px 5. Evaluate the following commutators: (Remember that i dx ). (a) [x.y] (b) [x.px] (c) [ps.py] (d) [x².px] (e) [(1/x).px] (f) [(1/x).p²] (g) [xpy-ypx.yp-zpy
