Which of the following effects is caused by atmospheric turbulence?
A) twinkling of stars
B) light pollution
C) magnification of images
D) diffraction of light
A
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William and Caroline Herschel's map included four of the following hypotheses in their model of the galaxy. Which one was the exception? a. They thought that the "holes in the sky" were caused by interstellar dust clouds. b. They proposed that the galaxy had a disk shape
c. They provided accurate measurements of the distances to stars. d. They placed the Sun in the center of the galaxy. e. They found errors caused by a lack of knowledge of the interstellar medium.
An object moving on the x axis with a constant acceleration increases its x coordinate by 80 m in a time of 5.0 s and has a velocity of +20 m/s at the end of this time. Determine the acceleration of the object during this motion
a. ?1.6 m/s2 b. +6.4 m/s2 c. +1.6 m/s2 d. ?2.0 m/s2 e. ?6.4 m/s2
A length of organ pipe is closed at one end. If the speed of sound is 344 m/s, what length of pipe (in cm) is needed to obtain a fundamental frequency of 50 Hz?
a. 28 b. 86 c. 344 d. 172 e. 688
How many electrons pass through a 20-W resistor in 10 min if there is a potential drop of 30 volts across it?
a. 5.6 × 10^21 b. 7.5 × 10^21 c. 9.4 × 10^21 d. 1.1 × 10^21 e. 3.8 × 10^21