A drawing is placed 40 cm in front of a thin lens. If a virtual image forms at a distance of 50 cm from the lens, on the same side as the drawing, what is the focal length of the lens?
A) -45 cm
B) 75 cm
C) 90 cm
D) 200 cm
D
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Indicate whether the statement is true or false
The frequencies needed to reproduce high-quality sounds are
A) within the range of hearing. B) beyond the range of hearing. C) centered about 2000 hertz. D) none of the above
If 4.0 J of work are performed in stretching an ideal spring with a spring constant (force constant) of 2500 N/m, by what distance is the spring stretched?
A) 3.2 cm B) 3.2 m C) 0.3 cm D) 5.7 m E) 5.7 cm
For an atom of hydrogen where the quantum number n = 3, how many possible independent configurations of the atom exist (consider principal quantum number n, angular momentum quantum number l, magnetic quantum number ml, and magnetic spin quantum number ms)?