Recent content by sgoeke

Homework Statement A 12.6 V battery supplies a 2.0 A current for 10 minutes. What is the work done by the battery during this process? Homework Equations I=q/t The Attempt at a Solution I'm really drawing a blank on how this connects to work.

Thanks...that really really helped!

Homework Statement Two capacitors with capacitances of 1.0 μC and 0.50 μF, respectively, are connected in series. The system is connected to a 100 V battery. What charge accumulates on the 1.0 μF capacitor? Homework Equations For capacitors in series: 1/C(equiv) = 1/C1 + 1/C2 V =...

So the energy would need to be larger than the work function? So the least amount of energy for the ones given would be 3.5?

The KE depends on the light frequency and the critical frequency is the photons whose energy is equal to the work funciton. I guess I'm really not making the connection for this problem even after reading this section of my textbook multiple times.

How do you know you produce a photoelectron?

KE is the kinetic energy, E is the energy of the photon (E=hf or E=hc/lambda), and W is the work function. 3 eV is the work function (W). We're looking for E. But I don't know what KE would be.

Homework Statement Of the following energies for photons, which is the least energy that could result in photoeletron production if the work function is 3.00 eV? a. 1.50 eV b. 2.90 eV c. 3.50 eV d. 6.01 eV Homework Equations KE = E - W The Attempt at a Solution I don't know...

Homework Statement A ray of light travels across a glass-to-liqued interface. If the indices of refraction for the liquid and glass are, respictevly 1.75 and 1.52, what is the critical angle at this interface? Homework Equations critical angle = inverse sin (n2/n1) The Attempt at a...

would i need to find the volume of the earth?

Homework Statement The intensity of light from the Sun is 1.3 kW/m^2 at the distance of the Earth. The Earth’s radius is 6.4 × 10^6 m. If all the sunlight that hits the Earth were absorbed, what would be the magnitude of the resulting force on the Earth? Homework Equations F=IA/c...

Homework Statement Determine the amount of energy carried in 1 m of a 3.5 mW He-Ne laser beam if the cross-sectional area of the beam is 5x10^-6 m^2. Homework Equations J/s = Watt The Attempt at a Solution I converted the mW to W. I feel like I should put .0035W over 5x10^-6 m^2 to...

Homework Statement What is the maximum value of the electric field E at 1.0 m from a 100 W light bulb radiating in all directions? Homework Equations I feel like I should use this equation: I=(1/2)(8.85x10^-12)(c)E^2 The Attempt at a Solution When I used that equation, I didn't get...

Homework Statement Two long parallel wires 20 cm apart carry currents of 5.0 A and 8.0 A in the same direction. Is there any point between the two wires where the magnetic field is zero. Homework Equations B=muI1I2/(2pir) The Attempt at a Solution I set the two B equations equal to...