Wave 1 has intensity 9.0 units while wave 2 has intensity 4.0 units. What is their ratio of amplitudes,
A1/A2?
A. 20
B. 5.1
C. 2.3
D. 1.5
E. 1.3
D. 1.5
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A charged particle of enters a region of magnetic field at a speed of 
at an angle of 37 degrees relative to the magnetic field direction. If the magnetic field strength is 1.2 T and the charge of the particle is +e, and the radius of the helical path is 8.9 cm, what is the particle’s mass?
a. 
b. 
c. insufficient information given.
d. 
In the two-slit experiment, monochromatic light of frequency 5.00 × 1014 Hz passes through a pair of slits separated by 2.20 × 10-5 m. (c = 3.00 × 108 m/s)
(a) At what angle away from the central bright spot does the third bright fringe past the central bright spot occur? (b) At what angle does the second dark fringe occur?
Why is the temperature at the region of a sunspot cooler than the photosphere?
a. They are holes in the photosphere that reveal the lower temperature gases in the deeper layers. b. They represent points where streams of cool gas from the corona lower the temperature in those regions of the photosphere c. Powerful magnetic fields in the sunspots act upon the atoms of the photosphere to prevent them from emitting light. d. Powerful magnetic fields inhibit the convective flow of the gases of the photosphere downward allowing them to cool for longer than would normally be permitted.
Most large spirals and ellipticals are comparable to the Milky Way in mass
Indicate whether the statement is true or false