According to a Quizlet, An electromagnet is a solenoid with a ferromagnetic core. Both a solenoids and an electromagnet's magnetic field increases when the number of coils, closeness of the coils, and current increases.
Energy of a wave: E = nhc/λ 3000 = (n x 6.63 x 10⁻³⁴ x 3 x 10⁸)/(510 x 10⁻⁹) n = 7.69 x 10 ²¹ photons per second per meter² 2.70 cm² = 2.70/10,000 m² = 2.7 x 10⁻⁴ Photons per second = 7.69 x 10 ²¹ x 2.7 x 10⁻⁴ = 2.08 x 10¹⁸ photons per second
