Find the kinetic energy (in terms of Planck's constant) of a baseball (m = 1 kg) confined to a one-dimensional box that is 25 cm wide if the baseball can be treated as a wave in the ground state
a. 3 h2
b. 2 h2
c. h2
d. 4h2
e. 0.5 h2
b
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Which of the terrestrial planets does not have any craters?
A. Mercury B. Venus C. Mars D. Earth E. All of them have craters.
Find the frequency of X-rays of wavelength 1 Å = 10?10 m
a. 3 × 10^18 Hz b. 3 × 10^10 MHz c. 6 × 10^9 Hz d. 3 × 10^8 Hz e. 3 × 10^20 Hz
In the hydrogen atom the potential energy is negative, but the absolute value of the potential energy:
a. is half the kinetic energy of the electron. b. is equal to n2 times the kinetic energy of the electron. c. is equal to the kinetic energy of the electron. d. is twice the kinetic energy of the electron.
Phase Angles: A 200-? resistor, a 40-mH inductor, and a 2.0-?F capacitor are connected in series with a 120-V rms source at 1.0 kHz. What is the phase angle of this circuit?
A. 49° B. 90° C. 41° D. 0° E. 45°