State which element is oxidized and which is reduced in the reaction Al + 3F2 ? 2AlF3
Al is oxidized; F is reduced.
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Reverberation of sound occurs for
A) sound interference. B) forced vibrations. C) re-echoed sound. D) resonance. E) none of the above
The force that acts between a pair of magnetic poles depends on
A) magnetic pole strength. B) separation distance. C) both of these D) neither of these
The pregalactic blobs started with masses comparable to big globular clusters
Indicate whether the statement is true or false
A 35-mm digital camera using a standard 50.0 mm lens is focused on a 1.80 m tall person who is standing 3.25 m from the lens
You now refocus the camera on a 15.0 cm tall flower that is 75.0 cm from the lens. (a) In refocusing, by how much did you move the lens? Did you move it toward the film or away from it? (b) What is the height of the flower's image on the CCD sensor?