Translation: Q1: If the current in a 3.20 mm diameter cylindrical wire is 340 uA, what is the average current density in the wire? Q2: Progressive waves are created on a string under tension by moving one end. If we start to move faster, without changing the tension of the string, how the waves will propagate Q3: A warning siren mounted on a building has a frequency of 82.0 Hz. What is the perceived frequency of a car approaching the siren at a speed of 40.0 km/h? The speed of sound in air is 340 m/s. Q4: A metal with a work function of 2.70 eV is illuminated with monochromatic light of monochromatic light of energy 3.60 V. What is the modulus of the stopping potential in this experiment? Q5: A point charge Q is located near another charge 3Q. and they are the only charged objects present. If the modulus of the electric force on Q is F, what is the electric force on 3Q? Q7: A long, thin rod, parallel to the y axis, is located at x = +2.80 cm. The rod carries a uniform charge density of 3.10 nC/m What is the modulus of the electriquet field at the origin? Q8: Question 8 (1 point) A thin convex-concave lens has radii from the convex surface 21.0 cm and from the concave surface 56.0 cm. If the lens used has an index of refraction of 1.5, what is its focal length? Give the answer in cm Q9: Question 9 (1 point) Five capacitors are connected to a potential difference Vab as shown in the figure. shown in the figure. The dielectric strength of the dielectric materials used allows a maximum voltage of 40.0 V for each capacitor. What is the maximum possible value of Vab that will not damage the capacitors? Q10: The radiation of a black body at absolute temperature T has the maximum intensity at wavelength X. At temperature 2T, what will be the wavelength of the emission peak