An electron moves in a circular path in a region of space filled with a uniform magnetic field B= 0.4 T. To double the radius of the electron's path, the magnitude of the magnetic field must become:

a. 0.8T
b. 0.2T
c. 0.1T
d. 0.3T
e. zero

If 21.2 kcals of energy is released by this reaction, how many kj does the reaction release? (1 cal 4.184 j)

Write down two additional questions about earth's magnetic field that will make your presentation more informative.

Amichelson interferometer operating at a 600 nm wavelength has a 3.02-cm-long glass cell in one arm. to begin, the air is pumped out of the cell and mirror m2 is adjusted to produce a bright spot at the center of the interference pattern. then a valve is opened and air is slowly admitted into the cell. the index of refraction of air at 1.00 atm pressure is 1.00028.how many bright-dark-bright fringe shifts are observed as the cell fills with air?