Introduction To Health Physics
5th Edition
ISBN: 9780071835275
Author: Johnson, Thomas E. (thomas Edward), Cember, Herman.
Publisher: Mcgraw-hill Education,
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Chapter 10, Problem 10.9P
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- The linear absorption coefficient of 1 MeV X-rays in water is 7.06 m-1. How many times will the radiation intensity decrease in a 19.6 cm thick water layer?arrow_forwardIn an isolated conducting wire, although conduction electrons are available, there will beno current. Why? (b) A 6.0-MeV beam of protons has a density of 2.6 × 1011 m-3 and anarea of 1.9 mm2 . What is the beam current? (proton mass = 1.67× 10-27 kg)arrow_forwardIn my laboratory, if I notice my vacuum system has a leak to atmosphere, I use a mass spectrometer to find the leak. I connect my vacuum system to the mass spectrometer, and spray my systems walls with helium. If the mass spectrometer reads helium when I spray a particular wall of my system, I can pinpoint where the leak is. Suppose an ionized helium atom has a mass of 6.6 x 10^-27 kg and a speed of 4.4 x 10 ^5 m/s as it moves into the mass spectrometer. It moves perpendicular to a .75 T magnetic field on a circular path that has a .012-m radius. Determine whether the charge of the ionized atom is +e or +2e.arrow_forward
- Thor has two square prism conductors that are made of the same ohmic material and with properties indicated below. Conductor | Length | Cross-Section Side Length Alpha L Beta L/2 8/4 Suppose both conductors are subject to the same potential difference AV across their length while keeping their temperatures fixed. Which of the following is the correct relation between the electric currents, Ia and IB, through Alpha and Beta? A. Ia = 81g B. 8Ia = I8 C. Ia = 4Ig D. 4Ia = I8arrow_forwardThe emissivity of the human skin is 97.0 percent. Use 35.0 °C for the skin temperature and approximate the human body by a rectangular block with a height of 1.76 m, a width of 43.5 cm and a length of 22.0 cm. Calculate the power emitted by the human body. 2301 J units. No What is the wavelength of the peak in the spectral distribution for this temperature? Fortunately our environment radiates too. The human body absorbs this radiation with an absorbance of 97.0 percent, so we don't lose our internal energy so quickly. How much power do we absorb when we are in a room where the temperature is 23.0 °C? How much energy does our body lose in one second?arrow_forwarda. what is the power radiated per square centimeters from skin at a temp. of 306°K.?arrow_forward
- Is your textbook the kind of idealized object (described in section on radiation laws) that absorbs all the radiation falling on it? Explain. How about the black sweater worn by one of your classmates?arrow_forwardSome incandescent light bulbs are filled with argon gas. What is vrms (m/s) for argon atoms near the filament, assuming their temperature is 2950 K? The atomic mass of argon is 3.948 u.arrow_forwardThere is one part to this question. I need to know the nm. Thank you!arrow_forward
- A stream of electrons with a linear number density of 3.10 x 1011 electrons/meter are accelerated from rest by a 62.0-V potential difference applied across two parallel plates. The electrons then pass through an aperture in the high voltage plate and into a current collector where the beam current is measured. Note: The mass of an electron is 9.11 x 10-31 kg. (a) What is the magnitude of the electric field between the plates if they are 2.07 m apart? V/m (b) What is the final velocity of each electron? m/s (c) What is the beam current? Aarrow_forwardYou are given the following data for the specific charge of copper ions experiment, 田 Current Time Initial mass Final mass I (A) t (s) 2000 mi (g) 42.60 m2 (g) 0.5 42.93 Where GI = 0.01 A, ot = 0.005 s, GM = 0.005 g. Then, determine the standard deviation of the specific charge (oK). O a. 0.71x10° C/kg Ob. 0.19x105 C/kg O C. 0.09x106 C/kg d. 0.66×106 C/kg e. 0.31x105 C/kgarrow_forwardII. Power A. Sample Problems: 1 W-500 Joules t=25 seconds P=? 1 P=25 watts W-5000 Joules t=? 1 P=170 watts t=20 seconds W = ? bons Formula: Substitution: Answer with unit of measure: Formula: Substitution: Answer with unit of measure: Formula: Substitution: Answer with unit of measure: how I msidor siqma2 A 21519m 02-b W 1 If a man moves a large box that weighs 10 Newtons 20 meters in 30 seconds, how much power was used?arrow_forward
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