How fast must a hydrogen atom be traveling for its kinetic energy to be just enough to excite the ground-state atom to its first excited state in a collision? (1 eV = 1.60 × 10-19 J, mH ? mproton = 1.67 × 10-27 kg)
A) 44.2 km/s
B) 21.7 km/s
C) 66.5 km/s
D) 113 km/s
E) 51.0 km/s
Answer: A
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A) 1.022 MeV B) 223. MeV C) 1.88 GeV D) 940. MeV E) 0.47 GeV
What is the ratio of the light-gathering power of a telescope with a primary lens of diameter 10 m to a telescope with a primary lens of diameter 1 m?
A) 10 to 1 B) 1 to 10 C) 100 to 1 D) 1 to 100
Young's Modulus: A 7.0-kg pipe is hung from a steel wire that is 2.5 m long and has a diameter of 0.75 mm. Young's modulus for steel is 2.0 × 1011 N/m2.(a) By what distance does the wire stretch?(b) If the wire diameter were doubled, what would be the stretch?
What will be an ideal response?
The age of a star cluster may be estimated by determining the ________ of the Main Sequence at which stars are just in the process of evolving away to become giant stars
Fill in the blank(s) with correct word