For an experiment to study a crystal of NaCl, you are considering using either a beam of photons or a beam of electrons, each with the same wavelength of 0.281 nm, equal to the separation of the Na and Cl ions in the crystal. (8) a) Find the energy of the photons and the kinetic energy of the electrons in the beams. Which beam would you choose

the correct answer is answer a. a mixture

no other options make sense

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  - sprinkles

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.