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 6, Problem 6.29P
To determine
The rate of temperature rises in the water,
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A bag of frozen vegetables with temperature 32◦F is placed in a 75◦F room. After 20 minutes, the temperature of the vegetables has risen to 41◦F. Using this information, find an exponential formula for the temperature of the vegetables where time is measured in minutes. To find the exponential formula, transform the temperature into a new variable for which the problem can be solved as an exponential growth/decay problem. Then find the formula in that variable and transform back to temperature. Based on the formula, what is the temperature of the vegetables after 45 minutes?
A temperature rise of 3.10 ± 0.20 °C was measured when a reaction was carried out in a calorimeter with a heat capacity of 0.841 ± 0.014 kJ °C -1 .The enthalpy change (Δ H ) was worked out as -2.61 kJ by using the equation:Enthalpy change (Δ H ) = heat capacity ( c ) × temperature change ( T )What is the root-squared error (in kJ) for Δ H ?Quote your answer to two decimal places.When you submit your answer, do NOT include units.(The minus sign in front of the enthalpy change indicates that the reaction is exothermic; don't include it in your calculation.)
A 20.65 g of ice at -10°C was completely melted in 115.35 g of water with an initial temperature of 75°C. The final temperature of the melted ice and water is 52°C. If you are to compute for the value of the latent heat of fusion of the experiment, how much is the percent error compared to the theoretical value?
specific heat of ice = 2090 J/kg∙K
specific heat of water = 4186 J/kg∙K
theoretical value of Lf = 334×103 J/kg
A.
less than 1%
B.
between 1% to 5%
C.
between 5% to 10%
D.
more than 10%
Chapter 6 Solutions
Introduction To Health Physics
Ch. 6 - A 50-µC/kg (approximately 200 mR) pocket dosimeter...Ch. 6 - Prob. 6.2PCh. 6 - Prob. 6.3PCh. 6 - Prob. 6.4PCh. 6 - Prob. 6.5PCh. 6 - Prob. 6.6PCh. 6 - Prob. 6.7PCh. 6 - Prob. 6.8PCh. 6 - Prob. 6.9PCh. 6 - Prob. 6.10P
Ch. 6 - Prob. 6.11PCh. 6 - Prob. 6.12PCh. 6 - Prob. 6.13PCh. 6 - Prob. 6.14PCh. 6 - Prob. 6.15PCh. 6 - Prob. 6.16PCh. 6 - Prob. 6.17PCh. 6 - Prob. 6.19PCh. 6 - Prob. 6.20PCh. 6 - Calculate the average power density, in watts per...Ch. 6 - Prob. 6.22PCh. 6 - Prob. 6.23PCh. 6 - Prob. 6.24PCh. 6 - Prob. 6.26PCh. 6 - Prob. 6.27PCh. 6 - Prob. 6.28PCh. 6 - Prob. 6.29PCh. 6 - Prob. 6.33P
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