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
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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
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
The symbol indicating the number of neutrons in a nucleus is __________
Fill in the blank(s) with correct word
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.