A researcher is using x-rays to investigating a cubic crystal. He is looking at Bragg reflection from the planes parallel to the cube faces
He finds that when using x-rays with a wavelength of 0.165 nm, a strong first maximum occurs when the beam makes an angle of 23.5° with the planes. What is the spacing of adjacent atoms in this crystal?
0.207 nm
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Which of the following is (are) invariant(s)?
A. mass B. momentum C. energy D. the speed of light E. mass and the speed of light
In the afternoon, the decibel level of a busy freeway is 89 dB with 90 cars passing a given point every minute. Late at night, the traffic flow is only 5 cars per minute. What is the late-night decibel level?
a. 205 dB b. 9 dB c. 176 dB d. 89 dB e. 76 dB
The Earth's ionosphere partially blocks which form of electromagnetic radiation?
A) gamma rays B) ultraviolet C) visible light D) infrared E) radio
When you push a crate across a level floor at constant velocity, friction between the crate and the floor is
A) less than your pushing force. B) the same amount as your pushing force. C) more than your pushing force. D) none of the above