The three quarks in any baryon must all have different
a. baryon number.
b. color charge.
c. electric charge.
d. lepton number.
e. spin.
b
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Because the Hubble constant has a value of 70 km/s/Mpc, a galaxy 50 Mpc away would have a recession velocity of _______________ km/s. (Round your answer to the nearest 1 km/s)
Fill in the blank(s) with correct word
The cores of the terrestrial worlds are made mostly of metal because
A) the terrestrial worlds as a whole are made mostly of metal. B) metals sunk to the centers a long time ago when the interiors were molten throughout. C) the core contained lots of radioactive elements that decayed into metals. D) over billions of years, convection gradually brought dense metals downward to the core.
Alpha particles, each having a charge of +2e and a mass of 6.64 × 10-27 kg, are accelerated in a uniform 0.80-T magnetic field to a final orbit radius of 0.30 m. The field is perpendicular to the velocity of the particles
How long does it take an alpha particle to make one complete circle in the final orbit? (e = 1.60 × 10-19 C) A) 0.15 ?s B) 0.25 ?s C) 0.33 ?s D) 0.40 ?s E) 0.49 ?s
What is the wavelength of peak emission for a black body at 37°C?
(c = 3.0 × 108 m/s, Wien displacement law constant is 2.9 × 10-3 m ? K, ? = 5.67 × 10-8 W/m2 ? K4) A) 94 µm B) 78 µm C) 7.8 µm D) 9.4 µm E) 29 µm