A string is held taut between two supports 2.0 m apart. The longest and next-longest possible wavelengths for standing waves are
A. 6 m and 3 m.
B. 16 m and 5.3 m.
C. 4 m and 2 m.
D. 8 m and 4 m.
Answer: C
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The ground state of the Li++ ion is at (Li has atomic number 3)
A) -40.8 eV. B) -122 eV. C) Li++ does not have a ground state. D) -61 eV. E) -1.51 eV.
Kepler's first law of planetary motion defied what long-held belief with ancient astronomers?
a. a heliocentric Universe b. a geocentric Universe c. uniform circular motion d. parallax of newborn stars e. perfection of the heavens
The center of the Milky Way lies in the direction of the constellation Cygnus
Indicate whether the statement is true or false
A proton is accelerated from rest through a potential difference of 150 V. It then enters a region of uniform magnetic field and moves in a circular path (radius = 12 cm). What is the magnitude of the magnetic field in this region?
a. 18 mT b. 12 mT c. 15 mT d. 22 mT e. 10 mT