In the Bohr model of the hydrogen atom the non-radiating orbits are determined by quantizing the ________ (physical quantity).
What will be an ideal response?
angular momentum
energy
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Recent discoveries of two types of brown dwarfs have placed these stars near which spectral type of star?
a. hotter than O stars b. cooler than O stars c. hotter than M stars d. cooler than M stars e. at exactly the same level as G stars
Equipotential Surfaces: The equipotential surfaces for two spherical conductors are shown in the figure, with the value of potential marked on the line for each surface.(a) If the distance between points A and B is 2.5 cm what is the approximate intensity of the electric field between these two points?(b) If the distance between points C and D is 2.5 cm what is the approximate intensity of the electric field between these two points?
Fill in the blank(s) with the appropriate word(s).
A heavy bus bar is 20. cm long and of rectangular cross-section, 1.0 cm × 2.0 cm. What is the voltage drop along its length when it carries 4000. A? (The resistivity of copper is 1.69 × 10-8 ?-m.)
What will be an ideal response?
Gravitational lensing is caused by ____
a. refraction of light through hot intracluster gas b. stimulated emission of light passing through dark matter c. acceleration of photons by supermassive black holes d. scattering of photons off of thin intergalactic dust e. bending of light rays due to the curvature of space-time around a mass