Which expression correctly relates θ, d and λ? Explain using evidence from your observations

Question 18 of 18 The work function of metal D, OD, was determined using the photoelectric effect and 220. nm light. Electrons photo-ejected from metal D had a velocity of 8.34 x 105 m/s. What is the work function of metal D in eV? (1 eV = 1.60 x 10-19 J, the mass of an electron is 9.109 x 10-31 kg, and Planck's constant is 6.626 x 10-34 Js.)

How do I solve this problem?: The oil in an automobile is used to lubricate internal engine parts and keep these parts clean. Oil can be subjected to temperature differences as high as Δ?=312 ∘F, especially when it is near the combustion chamber. Derive an expression to convert this difference into degrees Celsius, and use that expression to find the value of Δ? in degrees Celsius.   I understand how to convert from F to C, but I don't know how to use an expression.

Which of the following statements is the best explanation for the sign and magnitude of AH below? |(g) + e→ I(g) AH = -270 kJ/mol The addition of an electron to I requires the addition of energy, because energy is always required to increase the number of electrons on an atom. The addition of an electron to I requires the addition of energy because I typically forms cation I+. The addition of an electron to I releases energy, because l has noble gas electron configuration. The addition of an electron to I releases energy because I has a small atomic radius.