Aluminium has atomic number 13 . In its ground state, how many electrons are in its n = 1 shell?
a. 6
b. 2
c. 3
d. 10
e. 16
b
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One of the harmonics of a column of air open at one end and closed at the other has a frequency of 448 Hz and the next higher harmonic has a frequency of 576 Hz. How long is the air column? The speed of sound in air is 343 m/s
A) 1.34 m B) 0.670 m C) 0.335 m D) 1.00 m E) 2.68 m
What is the most abundant molecule in interstellar clouds besides molecular hydrogen?
A) ammonia B) water C) methane D) molecular helium E) carbon monoxide
A long straight wire (diameter = 2.0 mm) carries a current of 30 A. What is the magnitude of the magnetic field 2.5 mm from the axis of the wire?
a. 3.2 mT b. 2.8 mT c. 2.4 mT d. 3.6 mT e. 3.0 mT
A small sphere of initial volume V is filled with n moles of helium at initial pressure and temperature P and T. Which of the following statements is true?