Answer the following questions

12 th science Physics Assignment a * * X rays with a wavelength of 71 pm are directed onto a gold foil and eject tightly bound elections from the gold atoms. The ejected elections then move in circular Patties of radius + in a region of uniform magnetic field, B. For the fastest of the ejected elections, the product Br is equal to 1.88 X10. "Tim. Find a ) the maximum Kinetic energy of those elections and by the work done In removing them from the gold atoms. ** * Light of wavelength Zoonm shines on an aluminum Surface; 4.2 ev is required to eject an election. What Is the Kinetic energy of the a ) fastest and b) slowest ejected elections? () what is the stopping potential for this situation? J) What Is the cut off wavelength for aluminum? * * The stopping potential for electrons emitted from a surface Illuminated by light of wavelength 491 nm Is O. FI V. When the Incident wavelength Is changed to a new value, the stopping potential is 1.43v. 9 ) What Is this new wavelength ? b) What Is the Work function for the surface