The approximate energy needed to ionize the n = 1 (the deepest) state in hydrogen is
a. 10 eV.
b. 10 keV.
c. 10 MeV.
d. 10 GeV.
e. 10 TeV.
A
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Resistance and Resistivity: The figure shows a graph of the resistance of a wire as a function of its length. What physical quantities does the slope of this graph represent?
A. the cross-sectional area of the wire B. the resistivity of the material of which the wire is made C. the product of the resistivity and the cross-sectional area of the wire D. the resistivity of the material divided by the cross-sectional area of the wire E. the reciprocal of the resistivity of the material
Optics of the Eye: A person's near point is 25 cm, and her eye lens is 2.7 cm away from the retina. What must be the focal length of this lens for an object at the near point of the eye to focus on the retina?
A. -3.4 cm B. -2.4 cm C. 2.4 cm D. 3.4 cm E. 2.6 cm
Consider again the objects you ranked by distance in Part A. Suppose each object emitted a burst of light right now. Rank the objects from left to right based on the amount of time it would take this light to reach Earth, from longest time to shortest time.
A solid state pulsed laser has an energy of 400 mJ per pulse. If its wavelength is 1.06 × 10^?6 m, how many photons are in each pulse?
a. 2 × 10^25 b. 2 × 10^21 c. 3 × 10^18 d. 6 × 10^38 e. 2 × 10^18