Which of these is an electronic instrument that can plot voltage as it varies with time?

A. An electroscope
B. An oscilloscope
C. An ammeter
D. A galvanometer


Answer: B

Physics & Space Science

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If the sound level increases by 20 decibels, by about how much has the intensity of sound (in W/m2) increased?

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The universe has been expanding at the same rate since its formation

Indicate whether the statement is true or false

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In our part of the universe, antimatter is

A) non-existent. B) plentiful. C) short-lived. D) long-lived.

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A cluster containing a thousand or more galaxies, usually mostly ellipticals, scattered over a volume only a few Mpc in diameter is referred to as a(n) _____

A) elliptical galaxy cluster B) irregular galaxy cluster C) poor galaxy cluster D) rich galaxy cluster

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