When myopia is corrected surgically, the shape of the ________ is changed
Fill in the blank(s) with correct word
cornea
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A 1-kg chunk of putty moving at 1 m/s collides with and sticks to a 5-kg bowling ball initially at rest. The bowling ball and putty then move with a momentum of
A) 0 kg m/s. B) 1 kg m/s. C) 2 kg m/s. D) 5 kg m/s. E) more than 5 kg m/s.
The dilemma known as the ultraviolet catastrophe was resolved in 1900 by
a. Bohr. b. Rutherford. c. Einstein. d. Planck.
An 800-kHz radio signal is detected at a point 9.5 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.23 V/m
Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the average electromagnetic energy density at that point? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2 ) A) 2.3 × 10-13 J/m3 B) 9.4 × 10-13 J/m3 C) 4.7 × 10-13 J/m3 D) 3.3 × 10-13 J/m3 E) 6.6 × 10-13 J/m3
When an electron in an atom goes from a higher energy level to a lower energy level, the atom may
A) emit a photon of a specific wavelength. B) absorb a photon of a specific wavelength. C) absorb several photons of a specific wavelength. D) emit a photon of any wavelength. E) absorb a photon of any wavelength.