An electron slowing from 0.998c to 0.500c loses how much momentum? (express the answer in MeV/c as well as N-s)
What will be an ideal response?
7.77 MeV/c = 4.15 × 10-21 N-s
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A standing wave is set up in a 200-cm string fixed at both ends. The string vibrates in 8 distinct segments when driven by a 120-Hz source. What is the wavelength?
a. 6 cm b. 13 cm c. 25 cm d. 50 cm e. 100 cm
Uncertainty Principle Using Energy and Time: A laser produces a beam of 4000-nm light. A shutter allows a pulse of light, 30 ps in duration, to pass through. What is the uncertainty in the energy of a photon in the pulse? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 2 ×10-6 eV B. 2 ×10-5 eV C. 2 ×10-4 eV D. 2 ×10-3 eV E. 2 ×10-2 eV
Molecular Rotation: For a diatomic quantum mechanical rotator, the energy difference between adjacent energy levels
A. increases as L increases. B. decreases as L increases. C. is constant for all L. D. varies randomly as L increases.
Which of the following describes a major danger of interstellar travel at near-light speed?
A) Atoms and ions in interstellar space will hit a fast-moving spacecraft like a flood of dangerous cosmic rays. B) Time dilation will slow the heart beats of the crew to a dangerously low rate. C) Asteroid fields floating in interstellar space will present a navigational challenge. D) Any interstellar journey will take much longer than the lives of the crew members.