The antiparticle of the electron is called the ______________
Fill in the blank(s) with correct word
positron
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Diffraction Gratings: A metallic sheet has a large number of parallel slits, 5.0 mm wide and 20 cm apart. This sheet is used as a diffraction grating for microwaves. A wide parallel beam of microwaves is incident normally on the sheet. If the intensity maxima occur 2.0° apart in the central region, what is the wavelength of the microwaves?
A. 5.0 mm B. 6.0 mm C. 7.0 mm D. 8.0 mm E. 9.0 mm
Radioactivity Basics: An oxygen-15 nucleus, 
O, decays to another atomic nucleus by emitting a ?+ ray. What is the other atomic nucleus?
A. 
N
B. 
F
C. 
C
D. 
C
E. 
N
What is the net force on a 10-kg solid steel sphere falling in air at terminal speed?
A. 980 N B. 200 N C. 98 N D. 49 N E. Some value other than those given above.
The wavelength of light visible to the human eye is on the order of 5 × 10^-7 m. If the speed of light in air is 3 × 10^8 m/s, find the frequency of the lightwave
a. 3 × 10^7 Hz b. 4 × 10^9 Hz c. 5 × 10^11 Hz d. 6 × 10^14 Hz e. 4 × 10^15 Hz