A beam of light of wavelength 630 nm is incident on a slit that is 0.400 mm wide. If the distance between the slit and the screen is 1.80 m, what is the width on the screen of the central bright fringe?
A) 1.94 mm
B) 2.94 mm
C) 3.54 mm
D) 5.67 mm
E) 6.94 mm
D
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Which of the following measurements can be made only by recording and comparing the amount of light received from an astronomical source at many different times?
A) the rate at which a variable star brightens and dims B) the general shape of an interstellar cloud of gas C) the color of a planet D) the number of bright stars in a nearby star cluster
The Earth's geological time scale is divided into four main
A) epochs B) periods C) eras D) eons
Sunspots increase and decrease periodically over a 15 year time span.
a. true b. false
Calculate the de Broglie wavelength for an electron (m = 1 × 10^-30 kg) moving at 3.1 × 10^6 m/s
a. 1.8 × 10^–10m b. 2.4 × 10^–10m c. 1.9 × 10^–10m d. 2.1 × 10^–10m