A person walks 25.0deg north of east for 2.70 km. how far, Ask an Expert

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Q1. Photons of energy 4.20 eV bombard the surface, which emits photoelectrons with kinetic energy from 0 to 1.9 eV. What is the threshold frequency for this surface?

Q2. A person walks 25.0° north of east for 2.70 km. How far would the person walk due north and due east to arrive at the similar location?

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