Mention the points that are need to be consudered while operating local business.​

Modern physics a photon emitted from an excited hydrogen atom has an energy of 3.02 electron volts. which electron energy-level transition would produce this photon? a. n=1 to n=6 b. n=2 to n=6 c. n=6 to n=1 d. n=6 to n=2 i chose b but the correct answer is d can someone tell me why? and what's the difference?

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?

Which of the following is the best name for mgcl2