What combination of quarks produces a proton and what are the electric charges on these quarks, expressed in terms of e?
What will be an ideal response?
uud, with charges +(2/3)e, +(2/3)e, and -(1/3)e
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When nucleons join to form a stable nucleus, energy is
A) destroyed. B) absorbed. C) released. D) not transferred. E) either absorbed or released depending on nucleons involved.
The creation of ____ require(s) that a young hot star (T 25,000 K) be relatively nearby
a. Emission nebulae b. HI regions c. Molecular clouds d. The cool gas of the interstellar medium e. 21 cm radiation
Waves on a String: A 90-gram wire that is 1.0 m long is under tension. When a transverse wave of frequency 890 Hz travels down the wire, its wavelength is 0.10 m and its amplitude is 6.5 mm. What is the tension in the wire?
A. 710 N B. 820 N C. 930 N D. 1000 N E. 1100 N
A measurement of an electron's speed is 2.0 × 106 m/s and has an uncertainty of 10%. What is the minimum uncertainty in its position? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg)
A) 0.91 nm B) 1.8 nm C) 2.7 nm D) 2.8 nm E) 5.0 nm