A string of linear density 1.5 g/m is under a tension of 20. N. What should its length be if its fundamental resonance frequency is 220. Hz?
A) 0.26 m
B) 1.1 m
C) 0.96 m
D) 43. cm
E) 2.1 m
A
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If the speed of an electron increases, its de Broglie wavelength
a. increases. b. decreases. c. stays the same. d. may increase or decrease.
Advantages of radio astronomy include
A) radio waves are not scattered or deflected by Earth's atmosphere. B) radio observations can be made even when the Sun is in the sky. C) radio observations can be made even when the sky is obscured by clouds. D) radio observations let astronomers study things that emit little visible light. E) all of the above.
Kepler's second law, which states that as a planet moves around its orbit it sweeps out equal areas in equal times, means that
A) planets have circular orbits. B) the period of a planet does not depend on its mass. C) a planet travels faster when it is nearer to the Sun and slower when it is farther from the Sun. D) a planet's period does not depend on the eccentricity of its orbit. E) planets that are farther from the Sun move at slower average speeds than nearer planets.
Calculate the number of atoms per unit volume in BCC solid sodium (Na) assuming that the lattice parameter for sodium is 0.428 nm.
What will be an ideal response?