If the radius of the electron orbit in the n = 1 level of the hydrogen atoms is 0.0529 nm, what is its radius for the n = 4 level? (Assume the Bohr model is valid)
a. 1.32 nm
c. 0.106 nm
b. 0.265 nm
d. 0.846 nm
D
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A pulsar requires that a neutron star I. rotate rapidly. II. have a radius of at least 10 km. III. have a strong magnetic field. IV. rotate on an axis that is different from the axis of the magnetic field
a. I & III b. I & IV c. II, III, & IV d. I, III, & IV e. I, II, III, & IV
The loop is entirely inside the field.
A. Current flows clockwise in the loop. B. Current flows counterclockwise in the loop. C. Current does not flow in the loop.
A sound wave in helium has an intensity of 
The density of helium is 0.179
and the velocity of sound in helium is 965 m/s. The pressure amplitude of the sound wave is
A. 
B. 
C. 
D. 
E. 
The figure below shows a planet traveling in a clockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
A. its speed is constant. B. its speed is increasing. C. its speed is decreasing. D. its speed is a maximum. E. its speed is a minimum.