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) 560 ?m
B) 9.8 ?m
C) 32,000 ?m
D) 4700 ?m
A
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With respect to the earth, object 1 is moving at speed 0.80 c to the right. Object 2 is moving in the same direction at speed 0.80 c with respect to object 1. How fast is object 2 moving with respect to the earth?
A) 0.64 c B) 0.98 c C) 0.16 c D) 1.6 c E) 0.80 c
Comparing objects in a related group can reveal patterns among them. These patterns in turn can help us learn more about those objects than we could by studying each individually. With this goal in mind, watch this animation of the planets in the Solar System and select all of the following choices that describe the patterns that you've observed. As you do so, think about the implications of how the Solar System may have formed.
Choose one or more: A. The size of all planets increases with distance from the Sun. B. Planets orbit the Sun in random directions. C. All planets orbit the Sun in a roughly flat plane. D. The closest planets to the Sun are much smaller than the planets that are farther away. E. The orbits of the outer planets (those most distant from the Sun) are spaced farther apart from one another than the orbits of the inner planets. F. The orbits of the planets are evenly distributed in distance from the Sun. G. All planets orbit the Sun in the same direction. H. All planets orbit the Sun in a spherical distribution.
In general, Globular clusters are ________ and ________ than open clusters
Fill in the blank(s) with correct word
What is the wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the n = 7 state to the n = 2 state?
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 199 nm B) 365 nm C) 4480 nm D) 398 nm E) 796 nm