An up quark (u) has a charge of +2/3 and a down quark (d) has a charge of ?1/3. Which of the following describes a neutron?
A) uuu
B) uud
C) udd
D) ddd
D) ddd
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What are superclusters?
What will be an ideal response?
Globular clusters have approximately how many stars?
a. 100,000 – 1,000,000 b. 10,000 – 90,000 c. 5,000 – 10,000 d. 1000 - 5000 e. less than 1000
A tracking station on Earth observes a rocket move away at 0.370c. This rocket is designed to launch a projectile at 0.505c relative to the rocket
What speed (in terms of the speed of light) does the tracking station measure for the projectile if it is fired (a) straight ahead of the rocket or (b) backward from the rocket?
A slit of width 0.010 mm has light of frequency 5.0 × 1014 Hz passing through it onto a screen 60 cm away. How wide is the central maximum? (c = 3.00 × 108 m/s)
A) 1.8 cm B) 0.12 cm C) 3.6 cm D) 7.2 cm E) 0.90 cm