It can be shown that the group velocity is ßc and the phase velocity is c/ß where ß= v/c. (Enter your answers, in terms of c, to at least four significant figures.) Find the group velocity of 5.7 MeV protons. 0.1102 X C Find the phase velocity of 5.7 MeV protons. 9.113✔✔ C Find the group velocity of 5.7 MeV electrons. 4.7 X C Find the phase velocity of 5.7 MeV electrons. 1.0034 ✓ C
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- In Millikan's oil-drop experiment, one looks at a small oil drop held motionless between two plates. Take the voltage between the plates to be 2161 V and the plate separation to be 2 cm. The oil drop (of density 0.81 g/cm3) has a diameter of 4.0 ×10-6 m. Find the charge on the drop, in terms of electron units. eSolve equation ( Fmag = evB = me v^2/r) for the speed of the electron. Write in terms of variable me, e, r, B. v = _______?__________In Millikan's oil-drop experiment, one looks at a small oil drop held motionless between two plates. Take the voltage between the plates to be 2247 V and the plate separation to be 1 cm. The oil drop (of density 0.81 g/cm3) has a diameter of 4.0 ×10-6 m. Find the charge on the drop, in terms of electron units. e
- The energy-level diagram for the atomic emission spectra of an unknown gas is presented in the diagram below. n = 4 4.0 ev n = 3 1.8 eV n = 2 1.5 ev n=1 O ev Part A Initially, electrons are only in the ground state (n=1). A beam of red light hits the gas. This beam is a continuous spectrum of red light (from 620 nm to 750 nm) How many absorption line/s will there be in the spectra? 1 Correct Part B Initially, electrons are only in the ground state (n=1). A beam of red light hits the gas. This beam is a continuous spectrum of red light (from 620 nm to 750 nm) Calculate the wavelength of the absorption line ? da = nm Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remainingIn the Millikan oil drop experiment tiny charged oil droplets generated by a spray are allowed to fall under gravity through a hole in a top electrode, T, towards a bottom electrode B separated from T by 1 cm. When a holding voltage Vh = +0.25V is applied between T and B the droplets are seen to be suspended motionless between the electrodes. What is the specific charge of the droplet q/m? Select one: a. 2.7 C/kg b. 1.5 C/kg c. 0.16 C/kg d. 0.392 C/kgI have put 1.37, 1.49, 1.50, 1.3, 1.3 x 10^-3 All have been wrong, I need help with (a).