According to quantum theory, the electron in a particular quantum state of the hydrogen atom has
A) a definite position.
B) a definite energy.
C) a definite velocity.
D) All of the above.
E) None of the above.
B
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When an object falls through the air, as velocity increases the net force
A) increases. B) decreases. C) remains the same whether in air or in a vacuum.
Energy Density: A 4.4 × 1014 Hz laser emits a 2.1 ?s pulse that is 5.0 mm in diameter. The energy density in the beam is 0.24 J/m3. How many wavelengths are there in the length of the beam? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A. 9.2 × 108 B. 2.8 × 109 C. 2.8 × 108 D. 9.2 × 109 E. 2.8 × 1010
On a certain planet an object of mass m is moving with an initial speed of 4 m/s. It comes to rest after traveling a horizontal distance of 10 m
If the coefficient of kinetic friction between the object and the surface is 0.2, what is the value of g on that planet? A) 4 m/s2 B) 6 m/s2 C) 8 m/s2 D) 10 m/s2 E) 12 m/s2
Faraday's Law: A closed flat loop conductor with radius 2.0 m is located in a changing uniform magnetic field. If the emf induced in the loop is 2.0 V, what is the rate at which the magnetic field strength is changing if the magnetic field is oriented perpendicular to the plane in which the loop lies?
A. 0.16 T/s B. 1.0 T/s C. 0.080 T/s D. 2.0 T/s