Which of the following statements is not true of the object known as Sgr A* in the center of our Galaxy?
A) It is by far the brightest source of visible light lying in the direction of the galactic center.
B) It is thought to harbor a black hole of more than 3 million solar masses.
C) It is a source of bright radio emission.
D) It is a source of X-ray emission that we have observed with telescopes in space.
A
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A kiloampere ? hour is a unit of:
A) current B) charge per time C) power D) charge E) energy
X-rays with a wavelength of 0.00100 nm are scattered by free electrons at 130°. What is the kinetic energy of each recoil electron?
What will be an ideal response?
Light with a wavelength of 310 nm is incident on a metal that has a work function of 3.8 eV. What is the maximum kinetic energy that a photoelectron ejected in this process can have?
A) 0.62 × 10-19 J B) 0.21 × 10-19 J C) 0.36 × 10-19 J D) 0.48 × 10-19 J E) 0.33 × 10-19 J
Compared to the buoyant force on you when floating in fresh water, buoyant force on you when floating in the dense water of the Dead Sea is
A) less because volume displacement is less. B) more because of the greater density of fluid displaced. C) the same.