Olbers's paradox makes an incorrect prediction that it gets dark at night because the Universe is:
A) eternal
B) closed.
C) static.
D) flat.
A
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A particle of light is called a ________________
Fill in the blank(s) with correct word
Consider the circuit shown below. Which of the circuit diagrams below that figure correctly represents the circuit shown? 
In which of the following processes does the system's rest mass change?
A) An automobile speeds up. B) A rubber ball is squeezed. C) The rest mass changes in both of the above processes. D) The rest mass changes in neither of the above processes.
A two-slit apparatus is covered with a red (660 nm) filter. When white light is shone on the filter, on the screen beyond the two-slit apparatus, there are 9 interference minima within the 4.5 cm-wide central diffraction maximum. When a blue (440 nm) filter replaces the red, how many fringes will there be in the central diffraction maximum?
A. 3 B. 13 C. 9 D. 6