Compared to a cluster containing type O and B stars, a cluster with only type F and cooler stars will be

A) further away.
B) older.
C) younger.
D) more obscured by dust.
E) less obscured by dust.


B

Physics & Space Science

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The symbol indicating the number of neutrons in a nucleus is __________

Fill in the blank(s) with correct word

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The trajectory of a cannonball fired from a canon depends on

1) the initial velocity. 2) the angle of projection. 3) the effects of air resistance. 4) all of these. When air resistance does affect motion, the cannonball doesn't travel 5) as high. 6) as far. 7) as high and as far.

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Which of the following types of galaxies have a disk and spheroidal component but lack spiral arms?

A) lenticulars B) ellipticals C) irregulars D) all of the above

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If the momentum of an electron is 1.95 × 10-27 kg ? m/s,

what is its de Broglie wavelength? (h = 6.626 × 10-34 J ? s) A) 340 nm B) 210 nm C) 170 nm D) 420 nm E) 520 nm

Physics & Space Science