141
39 of them.
Beta Decay (@chickenfingers is correct, thank you)
I options are 50, 90, 15, 400
M/6 = 15Multiply each side of the equation by 6 :M = 90
The decay equation for Yttrium-90 decay to form Zirconium-90 is: [ ^{90}{39}\text{Y} \rightarrow \ ^{90}{40}\text{Zr} + e^- + \overline{\nu}_e ] This represents beta minus decay, where a neutron in the Yttrium-90 nucleus transforms into a proton, electron (e^-), and anti-neutrino ((\overline{\nu}_e)).
The alpha decay of uranium-237 can be represented by the following equation: [^{237}{92}U \rightarrow ^{233}{90}Th + ^{4}_{2}He] This means that uranium-237 decays into thorium-233 and emits an alpha particle (helium-4 nucleus).
The decay product of Yttrium-90 is Zirconium-90, which is a stable isotope. Yttrium-90 undergoes beta decay to form Zirconium-90 by emitting a beta particle.
Since the atomic number of Sr is less than 90, Sr undergoes beta decay. Beta decay is when the element decays into another element and a neutron actually breaks apart (sort of) into an electron and proton; the proton attaches to the other element, but the electron stays alone. Thus: 90------>90 Y+e0-1 38 Sr--->39 Y+e *there should only be one e, and the 0 and -1 should be in front, just like with the elements, but the format deletes the extra spaces so i put it like that for clarity's sake. sorry!
The decay equation for uranium-238 (U-238) decaying into an alpha particle (helium-4) can be represented as follows: (^{238}{92}\text{U} \rightarrow ^{4}{2}\text{He} + ^{234}_{90}\text{Th}). This equation shows the radioactive decay process of U-238 into an alpha particle and thorium-234.
About 370 miles following this route:Take I-94 EAST to Wisconsin where I-94 joins with I-90, and then eventually, I-39.Stay on I-39/90/94 to I-39/90. Continue on I-39/90 to Illinois where I-39/90 becomes the Jane Addams Mem. Tollway.Stay on I-39/90 on the Jane Addams Mem. Tollway to I-39 SOUTH to BLOOMINGTON and NORMAL. EXIT RIGHT.Continue on I-39 SOUTH to I-88 TOLLWAY to MOLINE ROCK ISLAND and CHICAGO at EXIT 97 B-A. You want to exit at EXIT 97A onto I-88 EAST TOLLWAY to CHICAGO.Take I-88 EAST TOLLWAY to DeKalb.
39/90 = 13/30 ~= 0.433
(200-90)+20=10
39 / 90 x 100 = 43.33333
Alpha
The greatest common factor of 90 and 39 is 3
141