Recent content by MrDMD83

Nevermind. I forgot to initially subtract the mass of the 82 electrons from the mass of entire atom.

Homework Statement For lead N=210 Z=82 Pb (atomic mass = 209.984163 u) obtain each of the following: (a) The mass defect in atomic mass units u (b) the binding energy (in MeV) MeV (c) the binding energy per nucleon (in MeV) MeV Homework Equations The Attempt at a...

Homework Statement The K characteristic X-ray line for tungsten has a wavelength of 1.94 10-11 m. What is the difference in energy between the two energy levels that give rise to this line? Express this in each of the following units. (a) joules J (b) electron volts eV Homework...

Homework Statement The atomic number of tantalum is Z = 73. According to the Bohr model, what is the energy (in joules) of a K X-ray photon? Homework Equations Energy= -(13.6 eV)Z^2/n^2 The Attempt at a Solution I don't know what to use for n

Homework Statement Suppose the minimum uncertainty in the position of a particle is equal to its de Broglie wavelength. If the particle has an average speed of 4.7 105 m/s, what is the minimum uncertainty in its speed? Homework Equations lambda=h/p & (Py)(Y) is greater than or...

I've already solved part a. The De Broglie wavelength is given by the equation lambda=h/p .

what about the velocity?

Homework Statement Doubly ionized lithium Li2+ (Z = 3) and triply ionized beryllium Be3+ (Z = 4) each emit a line spectrum. For a certain series of lines in the lithium spectrum, the shortest wavelength is 1979.8 nm. For the same series of lines in the beryllium spectrum, what is the...

Homework Statement n a Rutherford scattering experiment a target nucleus has a diameter of 3.5 10-14 m. The incoming has a mass of 6.64 10-27 kg. What is the kinetic energy of an particle that has a de Broglie wavelength equal to the diameter of the target nucleus? Ignore relativistic...

Homework Statement What is each of the following? (a) the wavelength of a 6.0 eV photon m (b) the de Broglie wavelength of a 6.0 eV electron m Homework Equations ? The Attempt at a Solution None so far

Ok, I got it. I made the problem more difficult than it needed to be. Thank you for the help.

So I use .5mv^2 to get the KE. From there I divide the sum of the KE and work function by Planck's Constant. I then divide c by f to get the wavelength?

Could you be a bit more specific?

Homework Statement Light is incident on the surface of metallic sodium, whose work function is 2.3 eV. The maximum speed of the photoelectrons emitted by the surface is 1.08 106 m/s. What is the wavelength of the light? Homework Equations e=hf p=h/wavelength The Attempt...

Homework Statement Suppose that you are traveling on board a spacecraft that is moving with respect to the Earth at a speed of 0.925c. You are breathing at a rate of 10.0 breaths per minute. As monitored on earth, what is your breathing rate in breaths per minute? Homework Equations...