Choose the appropriate drop-down to complete the paragraph. Gallium-67 has a half life of 78.1 hours while radium-226 has a half life of 1600 years. [ Select] will have a larger activity and will release [ Select] radiation per unit time. The [Select] v the half-life the greater the activity of the isotope.

In the following equation, what particle or type of radiation decay is needed in order to balance it?Nd-147 → Pm-147 + ?

A positron and an electron annihilate each other upon colliding, thereby producing energy in the form of two gamma rays. Assuming that both gamma rays have the same energy (since both particles have the same mass), calculate the wavelength of the electromagnetic radiation used in pm. (1 pm = 10⁻¹² m; mass of electron (amu) = 0.000549)   Americium-241 is widely used in smoke detectors. Calculate the amount of americium-241 consumed in a smoke detector (initially containing 5.00 µg of Am), in micrograms, that has been used for one year if the half-life is 433 years.

All the disintegrations of a sample of an unknown nuclide weighing 4.6 x 10-2 g were counted. In the first half-life of the sample, the total number of disintegrations counted was 4.3 x 1020. What is the atomic weight of the unknown element?