Which of the following particles are not made up of quarks? (There could be more than one correct choice.)
A) alpha particle
B) electron
C) proton
D) positron
E) neutron
B, D
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Lens-Maker Formula: A double convex lens has faces with radii of magnitudes 18.0 cm and 20.0 cm. When an object is placed 24.0 cm in front of the lens, a real image is formed 32.0 cm from the lens.(a) What is the focal length of this lens?(b) What is the index of refraction of the material from which the lens is made?
Fill in the blank(s) with the appropriate word(s).
The tendency of an object to resist change in motion is called.
a. mass b. inertia c. friction d. velocity
Dark matter does not affect galaxy collisions
Indicate whether the statement is true or false
For which of the following does the Bohr model give good results?
1.the energy of the photons in the Balmer series 2.the filling of the electron shells 3.the splitting of the spectral lines for a source in a magnetic field 4.the fine structure of spectral lines