Use the variational principle approach to find the field equations of the theory (considered by a. s. eddington) l =(-g)trabedrabed abcd

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

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?