Saturday
May 25, 2013

Posts by beth

Total # Posts: 563

Physics
One kilogram of dry air at STP conditions is exposed to 1.00 R of X-rays. One roentgen is defined by Equation 32.1 in Section 32.1. An equivalent definition can be based on the fact that an exposure of one roentgen deposits 8.30 x 10-3 J of energy per kilogram of dry air. Usin...

Physics
Suppose a nucleus of 93X236 fissions into two fragments whose mass ratio is 0.37:0.63. With the aid of the drawing, estimate the energy (in MeV) released during this fission. The drawing Shows A large. The A1 smaller the A2, A2 is nearly double the size of A1

Physics
Consider the induced nuclear reaction 1H2 + 7N14 ---->6C12 + 2He4. The atomic masses are 1H2 (2.014102 u), 7N14 (14.003074 u), 6C12 (12.000000 u), 2He4 (4.0026030 u). Determine the energy (in MeV) released when the 6C12 and 2He4 nuclei are formed in this manner.

Physics
Suppose a nucleus of 93X236 fissions into two fragments whose mass ratio is 0.37:0.63. With the aid of the drawing, estimate the energy (in MeV) released during this fission. Ive treied to do this problem but i keep getting the wrong answer. I keep getting 164.253 MeV

math
Please simplify (-3)2(-3)2 + 22 * (5)(-1)

Chemisty
For an electron in a hydrogen atom, the z component of the angular momentum has a maximum value of Lz = 4.22 x 10-34 J·s. Find the smallest possible value (algebraically) for the total energy (in electron volts) that this atom could have

Physics
Determine the activity of 1.11 g of 88Ra226 (a) in disintegrations per second (Bq) (b) and in Curies (Ci). The half-life is 1600 yr (1 yr = 3.156 x 10^7 s). 1 Ci is equal to 3.7 x 10^10 Bq. I keep getting the wrong answer and use the equation H=kNo

Physics
When any radioactive dating method is used, experimental error in the measurement of the sample's activity leads to error in the estimated age. In an application of the radiocarbon dating technique to certain fossils, an activity of 0.15 Bq per gram of carbon is measured t...

chemistry
Determine the activity of 1.11 g of 88Ra226 (a) in disintegrations per second (Bq) (b) and in Curies (Ci). The half-life is 1600 yr (1 yr = 3.156 x 10^7 s). 1 Ci is equal to 3.7 x 10^10 Bq.

Physics
How many half-lives are required for the number of radioactive nuclei to decrease to 1/10^4 of the initial number?

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