Which of the following best describes the fundamental difference between two different chemical elements (such as oxygen and carbon)?
A) They have different numbers of protons in their nucleus.
B) They have different atomic mass numbers.
C) They have different numbers of electrons.
D) They have different names.
A) They have different numbers of protons in their nucleus.
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Nexrad radar uses a frequency of 2.7 GHz to measure the speed of cloud systems. The radio waves from the transmitter are sent outward to the cloud system and reflected back, Doppler shifted. A Nexrad system observes clouds moving toward the transmitter at 21 m/s. What is the difference between the transmitted frequency and the frequency received after reflection off the cloud surface?
A. 380 Hz B. 760 Hz C. 570 Hz D. 190 Hz
Solids, liquids, and gases are called ______________ of matter
Fill in the blank(s) with correct word
A circular loop of radius 0.10 m is rotating in a uniform magnetic field of 0.20 T. Find the magnetic flux through the loop when the plane of the loop and the magnetic field vector are perpendicular
A) zero B) 3.1 × 10-3 T?m2 C) 5.5 × 10-3 T?m2 D) 6.3 × 10-3 T?m2 E) 9.2 × 10-3 T?m2
If an x-ray fluorescence spectrometer uses diffraction by a crystal to analyze the spectrum from a sample, this is called _________dispersion.
Fill in the blank(s) with the appropriate word(s).