How are elements beyond iron formed in massive-star supernovae?
A) Elements thrown out at high speeds fuse with hydrogen atoms in the interstellar medium.
B) Neutrons produced during the core collapse are slammed into atomic nuclei.
C) The high temperature and pressure allow iron nuclei to fuse.
B
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HII regions are found near stars cooler than 25,000 K because large amounts of ultraviolet photons would totally destroy the hydrogen atoms in the gas
a. True b. False Indicate whether the statement is true or false
The figure shows two connected wires that are made of the same material. The current entering the wire on the left is 2.0 A and in that wire the electron drift speed is vd. What is the electron drift speed in the wire on the right side?
A) 4vd B) 2vd C) vd D) vd/2 E) vd/4
A light ray in air is incident on an air-to-glass boundary at an angle of 33.0° and is refracted in the glass at an angle of 18.5° with the normal. Find the index of refraction of the glass
a. 1.78 b. 2.89 c. 2.95 d. 1.72 e. 1.58
A 0.120 pF parallel-plate capacitor is charged to a potential difference of 10.0 V and then disconnected from the battery. A cosmic ray burst creates 1.00 × 10^6 electrons and 1.00 × 10^6 positive charges between the plates. If the charges do not recombine, but reach the oppositely charged plates, by how much is the potential difference between the capacitor plates reduced?
a. 1.33 V b. 7.34 V c. 8.67 V d. 1,330 V e. 8,670 V