The gravitational force between two objects is inversely proportional to
A) the distance between the two objects.
B) the square of the distance between the two objects.
C) the product of the masses of the two objects.
D) the square of the product of the masses of the two objects.
E) none of the above
B
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A resistor and a capacitor are connected in series to an ideal battery of constant terminal voltage. When this system reaches its steady-state, the voltage across the resistor is
A) greater than the battery's terminal voltage. B) equal to the battery's terminal voltage. C) less than the battery's terminal voltage, but greater than zero. D) zero.
The half-life of a radioactive material is 4.5 days. How many days are required for a sample, with an initial activity of 1.0 × 105 Bq, to decay to an activity of 100 Bq?
A) 45 days B) 36 days C) 54 days D) 31 days
An electron is bound in an infinite square-well potential (a box) on the x-axis. The width of the well is L and the well extends from x = 0.00 nm to
In its present state, the normalized wave function of the electron is given by: ?(x) = sin (2?x/L). What is the energy of the electron in this state?(h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19) A) 0.10 eV B) 0.052 eV C) 0.13 eV D) 0.078 eV E) 0.026 eV
A 35-mm camera equipped with a 45-mm focal length lens is used to photograph a tree 15 m tall. If the aperture of the lens is set at f/2, what is the aperture diameter?
A) 14 mm B) 18 mm C) 32 mm D) 23 mm E) 27 mm