The number of cycles of a wave passing a point per unit time is the wave's __________
Fill in the blank(s) with correct word
frequency
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A uniform electric field 
is present in the region between infinite parallel plane plates A and B and a uniform electric field 
is present in the region between infinite parallel plane plates B and C. When the plates are vertical,
src="https://sciemce.com/media/2/ppg__cognero__Chapter_25_Gauss_apos_s_Law.__media__74c2e226-f250-4ef7-96dc-c383b4ea77d7.PNG" style="font-family:'times new roman';vertical-align:middle;" /> is directed to the right and to the left. The signs of the charges on plates A, B and C may be
A. ?, ?, ?.
B. +, ?, ?.
C. +, ?, +.
D. +, +, +.
E. any one of the above.
Stars are evenly distributed throughout the Universe.
a. true b. false
An electron is moving at 
m/s at an angle of 40 
to a 0.80 T magnetic field. What is the magnitude of the force on the electron?
A. 
B. 
C. 
D. 
E. 
On a cold day, a metal fence post feels colder to the touch than a tree. This sensation of different temperatures is explained by the fact that
A. the thermal conductivity of the wood in the tree is higher. B. the thermal conductivity of the metal is higher. C. the specific heat capacity of the wood in the tree is higher. D. the specific heat capacity of the metal is higher. E. the temperature of the tree is higher.