A boat sounds a fog horn on a day when both the sea water and the air temperature are 25.0° C. The speed of sound in sea water is 1 533 m/s. How much earlier (in s) does a dolphin 1 000 m from the source hear the sound than a person in a boat that is also 1 000 m distant? (Ignore the time it takes the sound to reach the water surface.)
a. 0.652
b. 2.12
c. 2.24
d. 2.77
e. 2.90
c
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Double-Slit Interference: In a two-slit experiment, the slit separation is 3.00 × 10-5 m. The interference pattern is created on a screen that is 2.00 m away from the slits. If the 7th bright fringe on the screen is 10.0 cm away from the central fringe, what is the wavelength of the light?
A. 100 nm B. 204 nm C. 214 nm D. 224 nm E. 234 nm
The diagram shows a plot of the temperature of the sun as a function of distance above the bottom of the photosphere. What is the temperature of the sun at a distance of 2,000 km?
a. 500 K
b. 900 K
c. 5,000 K
d. 9,000 K
e. 100,000 K
The principal greenhouse gases in our present atmosphere are:
A) hydrogen and helium. B) hydrogen sulfide and carbon disulfide. C) water vapor and carbon dioxide. D) methane and ammonia. E) sulfuric acid vapor and carbon dioxide.
Active galaxy is a galaxy:
A) whose center emits large amounts of excess energy. B) whose center does not have a black hole. C) that is in the process of merging with another galaxy. D) that manifests a blueshift instead of a redshift.