A triply ionized beryllium ion, Be3+ (a beryllium atom with three electrons removed), behaves very much like a hydrogen atom except that the nuclear charge is four times as great. Calculate its energy level at n = 2. A. 0.1 eV B. 4.7 eV C. 15.1 eV D. 30.6 eVThe photoelectric work function of potassium is 2.5 eV. If light having a. wavelength of 250 are falls on potassium, calculate the stopping potential in volts. A. 200.56 V B. 18.33 V C. 2.461! D. 0.?'3 V