An x ray can be emitted when an electron undergoes an energy level transition
Indicate whether the statement is true or false
T
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A(n)__________occurs when the Moon is at its greatest distance from Earth and the Moon is new
A) total solar eclipse B) partial lunar eclipse C) annular solar eclipse D) total lunar eclipse
Which of the following is a particle of light?
A) quark B) neutron C) proton D) electron E) photon
A bus is designed to draw its power from a rotating flywheel that is brought up to its maximum speed (3000 rpm) by an electric motor. The flywheel is a solid cylinder of mass 250 kg and radius 0.500 m (Icylinder = MR2/2). If the bus requires an average power of 10.0 kW, how long will the flywheel rotate?
a. 154 s b. 308 s c. 463 s d. 617 s
The mass of Mars, 6.40 × 1023 kg, is about one-tenth that of Earth, and its radius, 3395 km, is about half that of Earth. What is the mean density (mass divided by volume) of Mars in kilograms per cubic meter?
A) 9.76 × 102 kg/m3 B) 1.95 × 103 kg/m3 C) 3.90 × 103 kg/m3 D) 7.81 × 103 kg/m3