A proton's rest mass is 1.67 × 10^?27 kg. Calculate its kinetic energy when it is accelerated to a speed of 0.80 c
a. 1.0 × 10^?10 J
b. 1.5 × 10^?10 J
c. ?2.0 × 10^?10 J
d. 2.5 × 10^?10 J
e. 7.5 × 10^?10 J
a
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The wavelength of ultrasound at 1 million Hz in air where the speed of sound is 340 m/s is
a. 0.00000034 m b. 0.0000034 m c. 0.00034 m d. 0.34 m e. 340,000,000 m
The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a0 = 0.529 × 10^?10 m. The electric potential created by the electron at the position of the proton is
a. ?13.6 V. b. +13.6 V. c. ?27.2 V. d. +27.2 V. e. +5.12 × 10^9 V.
Periodic waves with a period of 0.026 s travel along a rod at 1200 m/s. What is the wave number k of the waves?
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