Which of the following in not a factor that prevents molecular cloud contraction?
a. thermal motion b. a force exerted by a magnetic field
c. orbital motion d. turbulence
c
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Which of the following particles are baryons?
A) electrons B) neutrinos C) protons D) quarks E) photons
The objective lens of a high-power microscope will have a ________ (large, short) focal length and will be a ________ (converging, diverging) lens.
Fill in the blank(s) with the appropriate word(s).
A capacitor with capacitance C is connected to a battery until charged, then disconnected from the battery. A dielectric having constant ? is inserted in the capacitor. What changes occur in the charge, potential and stored energy of the capacitor after the dielectric is inserted?
1.?V stays same, Q increases, U increases
2.?V stays same, Q decreases, U stays same
3.?V increases, Q decreases, U increases
4.?V decreases, Q stays same, U decreases
5.None of the above
6.Cannot be determined
Two sources of light illuminate a double slit simultaneously. One has wavelength 570 nm and the second has an unknown wavelength. The m = 5 bright fringe of the unknown wavelength overlaps the m = 4 bright fringe of the light of 570 nm wavelength
What is the unknown wavelength? A) 456 nm B) 326 nm C) 380 nm D) 713 nm