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Q. A beam of light of wavelength 700nm hits a black wall and is fully absorbed. if this light exerts a total force of 4nN on the wall, how many photons per second are hitting the wall?

Q. A violinist places her finger so that the vibrating section of a 1.20 g/m string has a length of 40.0 cm, then she draws her bow across it. A listener nearby in a 20 ^circ {rm C} room hears a note with a wavelength of 30.0 cm. What is the tension in this spring?

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