Matter Waves: If a proton and an electron have the same speed, which one has the longer de Broglie wavelength?
A. the electron
B. the proton
C. It is the same for both of them.
Answer: A
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A glider on an air track is connected by a spring to the end of the air track. If it takes 0.30 s for the glider to travel the distance of 12 cm from one turning point to the other, its amplitude is
A. 12 cm B. 6 cm C. 24 cm D. 36 cm E. 3.6 cm F. We are not given enough information to answer.
It is a misconception to imagine that space is empty-a vacuum
Indicate whether the statement is true or false
What is a white dwarf?
A) the exposed core of a dead star, supported by electron degeneracy pressure B) the exposed core of a dead star, supported by neutron degeneracy pressure C) a hot, but very small main-sequence star with a mass of less than 1.4 solar masses D) a cool and very small main-sequence star with a mass of less than 1.4 solar masses E) the name for the singularity at the center of a black hole
A piece of aluminum with a mass of 1.0 kg and density of 2700 kg/m3 is suspended from a string and then completely immersed in a container of water. The density of water is 1000 kg/m3. (a) Determine the volume of the piece of aluminum
(b) Determine the tension in the string after the metal is immersed in the container of water.