Both x-rays and electrons can form diffraction patterns when interacting with atoms in a solid. what would be the momentum (in kg m s–1) of an electron that had the same wavelength as an x-ray photon with a frequency of 1.5 × 1018 hz?

i would say b

explanation:

but i think i would need more information than that

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.