7431

Physics Modern Physics Level: Misc Level

X-rays of wavelength 10.0 pm are incident on a target. Find the wavelength of the x- rays scattered at (a)45.0% (b)90.0%.


7430

Physics Modern Physics Level: Misc Level

If the shortest wavelength produced by an x-ray tube is 0.46 nm, what is the voltage applied to the tube?


7429

Physics Modern Physics Level: Misc Level

The minimum energy required to remove an electron from a metal is 2.60 eV. What is the longest wavelength photon that can eject an electron from this metal?


7260

Physics Modern Physics Level: Misc Level

The isotope Cesium-137, which has a half life of 30 years, is a product of nuclear power plants. How long will it take for this isotope to decay to about one-sixteenth its original amount?


6723

Physics Modern Physics Level: Misc Level

A particle (mass=2.0 mg, charge=-6.0 uC) moves in the positive direction along the x axis with a velocity of 3.0 km/s. It enters a magnetic field of (2.0i+3.0j+4.0k)mT.What is the acceleration of the particle?

a.(36j-27k) m/s2

b.(-36j+27k) m/s2

c.(-24j+18k) m/s2

d.(24j-18k)m/s2

e.(24j-27k)m/s2


6255

Physics Modern Physics Level: Misc Level

An electron needs 2.2 eV to escape from a potassium surface.If ultraviolet light of wavelength 350 nm falls on the potassium surface, what is the maximum KE of the emitted electrons? 


6254

Physics Modern Physics Level: Misc Level

After 4,800 years, how much of an original sample of 1.5 grams of radium      (half- life=1,600 years) will remain?


6253

Physics Modern Physics Level: Misc Level

Actinium- 220 (atomic number 89)undeergoes two successive negative beta decays. Find the atomic number, mass number,and chemical name of resulting nucleus.


6240

Physics Modern Physics Level: Misc Level

In nuclear fission, a nucleus of uranium -238, which contains 92 protons, divides into two smaller spheres, each having 46 protons and a radius of 5.9x10^-15 m. What is the net force on this pair of molecules? (electrical and gravitational)


6236

Physics Modern Physics Level: Misc Level

 From the total energy release in a typical uranium fission dtermine approximately how many meV are realeased by each (nuchon uranium or proton ) when we assume that eacdh nucleon releases the same  amant of energy.


6186

Physics Modern Physics Level: Misc Level

In Lewis structures, the atomic symbol represents

a. valence electrons

b. atomic number

c. the nucleus & inner- shell electrons

d. a stable of electrons


6185

Physics Modern Physics Level: Misc Level

the correct symbol for a copper atom that has lost 2 electrons is 

a. Co+

b. C2-

c. Cu2+

d. Cu2-


6117

Physics Modern Physics Level: Misc Level

What is the de Broglie wavelength of an electron, M=1x10-31 kg which has been accelerated across a potential difference of 800 volts?


6116

Physics Modern Physics Level: Misc Level

Construct an energy-level diagram for doubly ionized lithium L2+


6115

Physics Modern Physics Level: Misc Level

Describe how the Bohr concept of the atom was able to explain the discrete sprctra for Hydrogen.Include stationary stares, emission, exited energy states. Diagrms can be used.


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