What wavelength monochromatic source in the visible region (390 to 710 nm) can be used to constructively reflect off a soap film (n = 1.46) in air if the film is 288 nm thick?
a. 561 nm
c. 587 nm
b. 480 nm
d. 467 nm
A
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In order to understand star clusters, we need to be able to estimate their ages. What technique do scientists use for this?
A) radioisotope dating B) counting the planets that have formed around the largest stars C) finding the main-sequence turnoff point of the stars D) calculating orbital parameters using Kepler's Laws E) measuring its parallax
The figure below shows a planet traveling in a counterclockwise 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.
If the distance between two isolated parallel plates that are oppositely charged is doubled, the electric field between the plates is essentially unchanged. However, the:
a. charge on each plate will double. b. force on a charged particle halfway between the plates will get twice as small. c. potential difference between the plates will double. d. force on a charged particle halfway between the plates will get four times as small.
An electron is an example of
A) a lepton. B) a meson. C) a baryon. D) a gauge boson. E) hadrons.