# Nuclear Decay - Page 2

Questions

- What nuclear decay can be stopped by aluminum?
- Find the binding energy of , whose atomic mass is 12.019 u?
- The half-life of a radioactive element is 5.0 days. A freshly-prepared sample contains 128 g of this element. After how many days will there be 16 g of this element left behind in the sample?
- Ordinary boron is a mixture of 10B5(mass no=10,atomic no=5)&11B5(mass no=11,atomic no=5)isotopes & has a composite atomic mass of 10.82u.What percentage of each isotope is present in ordinary boron?
- A 2500 sample of np-239 decays for 30 days. what mass will remain radioactive?
- What type of exhaust comes from a Steam Engine, Internal Combustion Engine, and a Hydrogen Fuel Cell?
- Why radioactivity is a nuclear phenomena even there is change in electrons ? Example. Uranium with 92 electron changes to thorium with 90 electron
- How does the liquid drop model account for Nuclear fission ?
- A radioactive element has a half life of 6 minutes if initial count rate is 824per minute the time taken by it to reach a count rate of 206 per minute is a) 20min b) 15min c) 12min?
- Please help with Physical Science?
- What did Henri Becquerel discover?
- State law of radioactive disintegration.derive relation betweenhalf life and decay constant ?
- If the half life of a radioactive substance is 4 days. Calculate the time required to decrease the concentration of 1/8th of original??
- What is the wavelength of the radio station 99x if it has a frequency of 99MHz?
- The distance between the Earth and the moon is 386000 km. What is the distance in scientific notation?
- After absorbing a neutron, a Uranium-235 nucleus can fission to produce Barium-141 and krypton-92. Calculate the energy that would be released from this fission of a Uranium-235 atom. How do you work this out?
- How long do radioactive nuclei stay radioactive?
- In nuclear decay, does the nucleus lose mass when emitting gamma radiation?
- Omg I need to write the nuclear equation for these things :) Can I get some help please? Awesome, thanks!
- I need to find the isotope's half - life. Can I get some help please? Thanks!