The distance between the ruled lines on a diffraction grating is 1,900 nm. The grating is illuminated at normal incidence with a parallel beam of white light in the 400 nm to 700 nm wavelength band
What is the angular width of the gap between the first order spectrum and the second order spectrum? A) 3.3°
B) 4.3°
C) 5.3°
D) 6.3°
E) 2.3°
A
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On a clear night when an observer in Los Angeles sees a first quarter Moon an observer in London would see
a. a full moon. b. a first quarter moon. c. a new moon. d. a third quarter moon. e. any of the above, depends on the time
The pressure of a gas depends on the temperature and density of the gas
Indicate whether the statement is true or false
Radio dishes are large in order to
A) attract funding from NASA and the NSF. B) give greater magnification. C) increase their angular resolution and collect the very weak radio photons. D) increase the range of waves they can collect. E) detect shorter waves than optical telescopes for superior resolution.
The possibility of extraterrestrial life was first considered
A) after the invention of the telescope B) only during the past few decades C) thousands of years ago during ancient times D) at the turn of the 20th century