Which is the most penetrating kind of radiation that can be shielded with aluminum foil a) alpha particles b) beta particles c) gamma rays d) high energy photons

What is the number of moles in 15.0 g ash3?

What is the maximum number of electrons that an atomic orbital can contain?

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.