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
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
Consider the circuit shown below. Which of the circuit diagrams below that figure correctly represents the circuit shown? 
