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1. Calculate Mass Defect of Nitrogen

Homework Statement For the common isotope of nitrogen, 14N, calculate the mass defect. Homework Equations \DeltaM = Zmp + Nmn - M The Attempt at a Solution 7(1.00727646688)+7(1.00866491560)-14.003074 \DeltaM = .108516177 Masteringphysics says this is wrong. says i may...
2. Consider a Hydrogen atom in the ground state

Homework Statement Consider a Hydrogen atom in the ground state Find: A- The Kinetic Energy, in eV B - The Potential Energy, in eV C - The Total Energy, in eV D - minimum energy required to remove the electron completely from the atom, in eV E - What wavelength does a photon with the...
3. Two Lens System - Image

Homework Statement A compound lens system consists of two converging lenses, one at x= -20cm with focal length f1 = +10cm, and the other at x= +20cm with focal length f2 = +8cm . An object 1 centimeter tall is placed at x = -50cm. What is the location of the final image produced by the...
4. Image Size In A Mirror

Homework Statement A guy named Joe, who is 1.6 meters tall, enters a room in which someone has placed a large convex mirror with radius of curvature equal to 30 meters. The mirror has been cut in half, so that the axis of the mirror is at ground level. As Joe enters the room, he is 5...
5. Wavelength, Frequency, & Speed of Light in Different Media

Homework Statement A beam of light from a monochromatic laser shines into a piece of glass. The glass has thickness L and index of refraction n=1.5. The wavelength of the laser light in vacuum is L/10 and its frequency is f. In this problem, neither the constant c nor its numerical value...
6. Converting to nanometers

Homework Statement i just need to convert 2.8*1014 into nano meters Homework Equations \lambda = v / f The Attempt at a Solution \lambda = v / f \lambda = 2.0*108 / 700*10-9 (nanometers) \lambda = 2.8*1014 i am backwards on my conversion, i am horrible at it...
7. Simple Index of Refraction Question - chart

Homework Statement what is the minimum value that the index of refraction can have? Homework Equations n1sin\Thetai = n2sin\Thetar The Attempt at a Solution my choices are: A - between 0 and 1 B - +1 C - -1 D - 0 all listed values in my given chart are...
8. Induced current through a resistor - with variable resistor and two coils

Homework Statement The two solenoids in the figure are coaxial and fairly close to each other. While the resistance of the variable resistor in the left-hand solenoid is increased at a constant rate, the induced current through the resistor R will A - flow from a to b. B - flow from...
9. Induced emf in secondary coil - help

induced emf in secondary coil - help ASAP Please Homework Statement A very long, straight solenoid with a cross-sectional area of 6.00 cm2 is wound with 40.0 turns of wire per centimeter, and the windings carry a current of 0.250 A. A secondary winding of 2.00 turns encircles the solenoid...
10. Torque on a soleniod / coil

Torque on a soleniod / coil in magnetic field Homework Statement A solenoid having 180 turns and a cross-sectional area of 6.68 cm2 carries a current of 1.12 A 1) If it is placed in a uniform 1.12 T magnetic field, find the torque this field exerts on the solenoid if its axis is...