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why transmission of electrons occours at metal boundry during thermionic emission?

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Using the given charge-to-mass ratios for electrons andprotons, and knowing the magnitudes of their charges areequal, what is the ratio of the proton’s mass to the electron’s?(Note that since the charge-to-mass ratios are given to onlythree-digit accuracy, your answer may differ from theaccepted ratio in the fourth digit.)
True or false? (a) The photon emitted in an n = 3 to n = 2 transition in the H atom has a lowerfrequency than the photon for an n = 2 to n = 1 H-atom transition. (b) The groundstate energy ofHe is about 4 times the ground-state energy of H. (c) yis zero at the nucleus for all H-atomstationary states. (d) For the ground state of the H atom, y2 is a maximum at the nucleus. (e) Themost probable value of the electron–nucleus distance in a ground-state H atom is zero. ( f ) Thesmallest allowed value of the atomic quantum number n is 0. (g) For H atom stationary stateswith l = 0, yis independent of qand f. (h) For the H-atom ground state, the electron is confinedto move on the surface of a sphere centered around the nucleus. (i) For the H-atom ground state, the electron is confined to move within a sphere of fixed radius.
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