A muon formed high in the Earth's atmosphere travels at a speed 0.990c for a distance of 6.40 km before it decays. What is the muon's lifetime as measured in its reference frame?
a. 4.65 × 10^-6 s
c. 2.18 × 10^-6 s
b. 1.55 × 10^-5 s
d. 3.04 × 10^-6 s
D
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A train travels at a constant speed of 60.4 mi/h for 101.5 min. What distance does the train cover expressed to the correct number of significant figures?
A) 100 mi B) 102 mi C) 102.2 mi D) 102.18 mi E) 102.181 mi
Our bodies, at 37.°C, emit radiation which peaks at what wavelength?
What will be an ideal response?
A. Bulb A glows but bulb B goes out. B. Bulb B glows but bulb A goes out. C. Both bulbs continue to glow. D. Both bulbs go out. E. One needs more information to answer.
What does the phenomenon of interference demonstrate?
A) the wave nature of light B) the polarization of light waves C) the quantization of the atomic orbitals D) the particle nature of the photon E) the process of ionization