What do we mean when we say that two light rays striking a screen are in phase with each other?
A) When the electric field due to one is a maximum, the electric field due to the other is also a maximum, and this relation is maintained as time passes.
B) They are traveling at the same speed.
C) They have the same wavelength.
D) They alternately reinforce and cancel each other.
A
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The heavier elements on Earth (those with atomic numbers greater than 5):
were in existence at the moment of the big bang. were formed immediately after the big bang. are formed by stellar nucleosynthesis during the life cycles of existing stars. are constantly being created by fusion in our Sun and blown here by the solar wind. All of the above are true statements.
The fusion reaction 
releases 17.6 MeV of energy. The mass of 2H is 2.01410 u, the mass of 4He is 4.00260 u, and the mass of 1n is 1.00866 u. What is the mass of 3H?
A. 2.99716 u B. 3.01605 u C. 3.03494 u D. 3.04221 u E. 2.99982 u
The force of kinetic friction between two surfaces is dependent on the relative speed of the two surfaces
Indicate whether the statement is true or false
The image of an object beneath the surface of a medium of refractive index n> 1 is seen in air by a person looking down on the surface. This image, formed by light rays leaving the flat refractive surface, is
A. real and closer to the viewer than the object. B. virtual and closer to the viewer than the object. C. real and farther from the viewer than the object. D. virtual and farther from the viewer than the object. E. virtual and the same distance from the viewer as the object.