The spacing between reflecting planes in a crystal is 2.82 × 10^?10 m. A beam of X-rays is strongly reflected at an angle of 160° with the crystal face. What is the wavelength of the X-rays?
1.55 × 10^?10 m
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The tension in a string from which a 4.0-kg object is suspended in an elevator is equal to 44 N. What is the acceleration of the elevator?
a. 11 m/s2 upward b. 1.2 m/s2 upward c. 1.2 m/s2 downward d. 10 m/s2 upward e. 2.4 m/s2 downward
What do we mean by the singularity of a black hole?
A) It is the center of the black hole, a place of infinite density where the known laws of physics cannot describe the conditions. B) It is the "point of no return" of the black hole; anything closer than this point will not be able to escape the gravitational force of the black hole. C) It is the edge of the black hole, where one could leave the observable universe. D) The term is intended to emphasize the fact that an object can become a black hole only once, and a black hole cannot evolve into anything else.
Which of the following questions are NOT addressed during the publishing and maintaining web design phase?
A. Who updates the content? B. What size limits exist for the website? C. Will you host the website on an internal web server or will you contract with an external vendor? D. How will you ensure your website navigation is both user-controlled and user-based?
Adiabatic Processes: A monatomic ideal gas at an initial temperature of 390 K is compressed adiabatically from an initial volume of 120 L to a final volume of 40.0 L. What is the final temperature of the gas?
A. 124 K B. 811 K C. 610 K D. 775 K E. 820 K