When de Broglie's matter waves are applied to electrons in the Bohr atom, which of the following occurs?
C,
The de Broglie wavelength of the electron orbiting the nucleus is quantized in the same way that Bohr's atom is quantized. An integral number of electron wavelengths is found in each electron orbit.
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What happens when a star like the sun exhausts its core hydrogen supply?
A) Its core contracts, but its outer layers expand and the star becomes bigger and brighter. B) It contracts, becoming hotter and brighter. C) It contracts, becoming smaller and dimmer. D) Its core contracts, but its outer layers expand and the star becomes bigger but cooler and therefore remains at the same brightness. E) It expands, becoming bigger but dimmer.
Mercury's magnetic field is generated by the same dynamo effect as Earth's
Indicate whether the statement is true or false
A 0.40-kg mass attached to the end of a string swings in a vertical circle having a radius of 1.8 m. At an instant when the string makes an angle of 40 degrees below the horizontal, the speed of the mass is 5.0 m/s. What is the magnitude of the tension in the string at this instant?
a. 9.5 N b. 3.0 N c. 8.1 N d. 5.6 N e. 4.7 N
Two infinite, uniformly charged, flat surfaces are mutually perpendicular. One of the sheets has a charge density of +60 pC/m2, and the other carries a charge density of -80 pC/m2 . What is the magnitude of the electric field at any point not on either surface?
a. 1.1 N/C b. 5.6 N/C c. 7.9 N/C d. 3.8 N/C e. 4.0 N/C