Light from a He-Ne laser of wavelength 633 nm passes through a circular aperture. The resulting pattern is observed on a screen 4.0 m behind the aperture, where the width of the central bright circle is 1.1 cm. What is the diameter of the hole?
A) 4700 ?m B) 32,000 ?m C) 9.8 ?m D) 560 ?m
D
Physics & Space Science
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The diagram illustrates a light source, a gas cloud, and three different lines of sight. Along which line of sight would an observer see an emission spectrum?
a. 1
b. 2
c. 3
d. 2 and 3
e. none of them
Physics & Space Science
About what percent of Earth's surface is covered by land?
a. 70% b. 10% c. 50% d. 30%
Physics & Space Science
The resolving power of a microscope refers to the ability to
A) distinguish objects of different colors. B) form clear images of two points that are very close together. C) form a very large image. D) form a very bright image. E) form a very microscopic image.
Physics & Space Science
Two identical steel balls are released from rest from the same height and travel along tracks as shown and labeled below