If a binary system has a period of 4 years and a separation of 5 AU, then the total mass is 7.8 solar masses
Indicate whether the statement is true or false
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Which of the following best describes the goal of SETI (Search for Extraterrestrial Intelligence)?
A) to detect signals originating from civilizations from outside the solar system B) to detect life of any kind, anywhere besides Earth C) to estimate the number of civilizations in the galaxy D) to find habitable planets around other stars
A 400-turn circular coil (radius = 1.0 cm) is oriented with its plane perpendicular to a uniform magnetic field which has a magnitude that varies sinusoidally with a frequency of 90 Hz. If the maximum value of the induced emf in the coil is observed to be 4.2 V, what is the maximum value of the magnitude of the varying magnetic field?
A. 59 mT B. 62 mT C. 65 mT D. 68 mT E. 31 mT
Consider a system containing three objects that move with different velocities. The objects can interact with each other through forces. In this system
A. the objects can only collide if an outside force is applied. B. any collisions between the objects must be elastic. C. the total momentum of the objects cannot change unless an outside force acts on the system. D. the total kinetic energy of the objects will not change unless an outside force is applied.
The Paschen series of hydrogen corresponds to electron transitions from higher levels to n = 3 . What is the shortest wavelength in that series? (R = 1.097 × 10^7 m?1 and 1 nm = 10?9 m)
a. 1875 nm b. 820 nm c. 1580 nm d. 656 nm e. 1094 nm