A standard candle is

A) a 7-cm-long wax candle.
B) a light source of known luminosity.
C) another name for a main-sequence star.
D) another name for a barred-spiral galaxy.


B) a light source of known luminosity.

Physics & Space Science

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A 3.7 pC charge experiences a force of N in an electric field. What is the magnitude of the electric field?

a.
b.
c.
d. 12 N/C
e.

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Which of the following molecules is the most abundant in molecular clouds?

A) CO B) H2O C) NH3 D) H2

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The magnetic quantum number m1 can have any integer value ranging from

A) -n to +n. B) -? to +?. C) 0 to n. D) 0 to ?. E) 0 to (n-1)

Physics & Space Science

The circuit below contains 5 identical light bulbs. The emf is 110 V. Which light bulb(s) is(are) brightest?

A. A: The one closest to the positive terminal of the battery. B. A and C: The bulbs closest to the positive terminal of the battery. C. A and B: Because they are closest to the terminals of the battery. D. C and D: Because they receive current from A and B and from E. E. E: Because the potential difference across E is that of the battery.

Physics & Space Science