When a wave source moves toward a receiver what does the receiver encounter?:
a) An increase in wave speed
b) Nothing
c) An decrease in wave frequency
d) An increase in wave frequency
Ans: d) An increase in wave frequency
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Diffraction Gratings: When red light illuminates a grating with 7000 lines per centimeter, its second maximum is at 62.4°. What is the wavelength of this light?
Fill in the blank(s) with the appropriate word(s).
A larger telescope will always have a higher spectral resolution than a smaller telescope when observing at the same wavelength
Indicate whether the statement is true or false
Seyfert galaxies
a. are more common in close pairs of galaxies than in isolated systems. b. emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. c. generally show redshifts greater than 6. d. are more common in close pairs of galaxies than in isolated systems and emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies. e. are more common in close pairs of galaxies than in isolated systems; emit more energy at X-ray, ultraviolet, infrared, or radio wavelengths than normal spiral galaxies; and generally show redshifts greater than 6.
To date relatively young rocks and materials, we use the decay of
A) uranium-238 to lead-206. B) potassium-40 to argon-40. C) carbon-14 to nitrogen-14. D) uranium-235 to lead-207.