Aphoton with a wavelength of less than 50.4 nm can ionize a helium atom.
what is the ionization potential of helium?
answer in j

Explanation:

The ionization potential is the energy required to separate an electron from an atom in gas state and, so, form an ion.

Since it is said that a photon with wavelength of less than 50.4 nm can ionize a Helium atom, the energy of such photon is the ionization potential (energy) of Helium.

The energy of a photon in terms of its wavelength is given by Planck - Einstein's equation:

Where,

Here you know the wavelength, λ = 50.4 nm. You must convert it to meter: 50.4 nm × 10 ⁻⁹ m.

Now you can substitute and compute:

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.