A hospital physicist measure the strength of a cobalt - 60 X-Ray machine every year.

Question: A hospital physicist measure the strength of a cobalt - 60 X-Ray machine every year. His result over a six year period are shown in the table. Strength is measured in MBq (megabecquerels) or millions of counts per second. Strength (MBq) C 10.0 8.8 7.8 6.9 6.1 5.4 4.8 Time t (years) ...continues

point source of light

Consider a point source of light. How would the intensity of light vary with distance from the source according to a) wave theory and b) particle or photon theory? Explain.

lyman vs. balmer series

The Lyman series is brighter than the Balmer series. Why? Why was the Balmer series discovered first?

Planck's constant

If Planck's constant were much, much larger how would this affect our everyday lives?

tunneling

A Hydrogen atom and a Helium atom each with 4 eV of KE approach a thin barrier 6 MeV high which has the greater probability of tunneling through the barrier? Explain.

zero point energy and uncertainty principle

Discuss the connection between zero-point energy of a particle in a box and the uncertainty principle

wavelength of proton anti-proton pair

What is the longest wavelength photon that can produce a proton anti-proton pair? Each has a mass of 1.67 x10-27 kg.

ionization energy

Calculate the ionization energy of doubly ionized Lithium Li2+ (which has Z = 3).

Current/Wire

Two uniform wires having circular cross-sections, both with the same length and made of identical material, are both maintained at the same potential difference and the same temperature. The first wire has a diameter of 2.2 mm and the second has a diameter of 4 mm. If the current in the first wire is 1.1 amps, then what is th ...continues

Work - potential difference in Volts from A to B

What is the potential difference in Volts from A to B if 13.2 Joules of work are required to move a charge of -.4405C from A to B?