Heat a copper wire and its electric resistance

A) decreases.
B) remains unchanged.
C) increases.


Answer: C

Physics & Space Science

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In pair creation, an electron-positron pair is created from

A) a photon. B) a neutron. C) a neutrino. D) a rabbit. E) nothing.

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What is the approximate magnification of a compound microscope with objective and eyepiece focal lengths of 0.30 cm and 4.1 cm, respectively, and a separation between lenses of 40 cm?

a. 320 b. 33 c. 32 d. 810 e. 7.1

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