A camera gives a correct exposure at f/4 with a shutter speed of 1/128 s. In order to increase the depth of field, the f-stop is changed to f/8. What shutter speed will now give a correct exposure if lighting conditions do not change?
1.1/512 s
2.1/256 s
3.1/32 s
4.1/16 s
3
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Entropy is a state function
Indicate whether the statement is true or false
One terminal of a battery is connected to a closed circuit, while the other terminal is left unconnected. Which of the following statements is true?
A) No current flows through the battery, and the potential of any point in the circuit is the same. B) No current flows through the battery, and the potentials of different points in the circuit are different. C) Current flows through the battery, and the potential of any point in the circuit is unchanged. D) Current flows through the battery, and the potentials of different points in the circuit are different.
Analysis of rocks returned from the lunar maria during the Apollo program suggest they formed
A) during the period of early bombardment constituting the first few hundred million years of the Earth's history B) fairly recently during the last million years or so C) roughly 65 million years ago D) between 3.9 and 3.0 billion years ago
Graphite, diamond and buckminsterfullerene are different forms of the element _______
Fill in the blank(s) with correct word