In stage 6 or 7 of the formation of a large cluster of stars, a nebula is formed around the cluster. This happens because:
A) the number of stars is so great and so intense that the gas from the original cloud is ionized.
B) the stars are out of their cocoons of dust and their radiation ionizes the gas from the original cloud.
C) there are brown dwarfs everywhere in between the stars, so the gas is lit up by their low-intensity light.
D) there are thousands of Sun-like stars with planets around them and the formation of planets ionizes the leftover gas.
E) there are massive O and B stars emitting high energy photons that ionize the remainder of the cloud.
E
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Ekapluto is an unknown planet that has two moons in circular orbits. The table summarizes the hypothetical data about the moons
Mass Radius Orbital Radius Orbital period Moon A 4.0 × 1020 kg 2.0 × 108 m 4.0 × 106 s Moon B 1.5 × 1020 kg 2.0 × 105 m 3.0 × 108 m The orbital period of Moon B is closest to A) 5.6 × 106 s. B) 6.0 × 106 s. C) 6.4 × 106 s. D) 6.9 × 106 s. E) 7.3 × 106 s.
An electron which moves with a speed of 7.5 × 10^3 m/s parallel to a uniform magnetic field of 0.40 T experiences a force of what magnitude? (e = 1.6 × 10^-19 C)
a. 1.9 × 10^-15 N c. 2.2 × 10^-24 N b. zero d. 4.8 × 10^-14 N
Diffraction Gratings: A metallic sheet has a large number of parallel slits, 5.0 mm wide and 20 cm apart. This sheet is used as a diffraction grating for microwaves. A wide parallel beam of microwaves is incident normally on the sheet. If the microwave wavelength is 6.0 cm, what is the largest angle from the normal, at which an intensity maximum occurs?
A. 64° B. 69° C. 74° D. 79° E. 84°
In the Bohr theory the orbital radius depends upon the principal quantum number in what way?
A) n B) 1/n C) n2 D) 1/n2 E) n3