The flatness problem and the horizon problem can be explained by ____
a. dark energy
b. the inflationary universe hypothesis
c. grand unified theories
d. the electroweak force
e. non-baryonic matter
b
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A “free” electron and a “free” proton are placed in an identical electric field. Is the following statement true or false?
The electric force on the proton is greater in magnitude than the electric force on the electron, but in the opposite direction.
1.False 2.TrueDiffraction Gratings: Monochromatic light is incident on a diffraction grating that is 75 mm wide and ruled with 50,000 lines. The second-order maximum is seen at 32.5°. What is the wavelength of the incident light?
A. 202 nm B. 403 nm C. 605 nm D. 806 nm
Two charges are located on the x-axis. A 22 ?C charge is located at the origin and a 47 ?C charge is located at x = 4.0 m. What is the magnitude of the electric field at x = 7.5 m?
a. 
b. 
c. 
d. 
e. 
Which of the following is a positive subatomic particle?
a. neutron only b. proton only c. electron only d. neutron and proton e. proton and electron