The current in a long wire creates a magnetic field in the region around the wire. How is the strength of the field at distance r from the wire center related to the magnitude of the field?
a. field directly proportional to r
b. field inversely proportional to r
c. field directly proportional to r2
d. field inversely proportional to r2
b
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In the context of the electromagnetic spectrum, which of the following types of electromagnetic radiation has the smallest wavelength?
A) X-rays B) Visible light C) Radio waves D) Gamma rays
The period-luminosity relation is critical in finding distances with:
A) RR Lyrae stars. B) trigonometric parallaxes. C) spectroscopic parallaxes. D) Cepheid variables. E) pulsars.
Primitive meteorites can be distinguished from other meteorites and terrestrial rocks because they
A) contain a noticeable fraction of pure metallic flakes. B) resemble the composition of Earth's core. C) contain a lot of iron and were used by humans to make iron tools. D) resemble the composition of Earth's mantle. E) resemble the composition of rocks from lava flows that occurred on asteroids very shortly after the formation of the solar system.
In a double-slit experiment, the slit separation is 2.0 mm, and two wavelengths, 750 nm and 900 nm, illuminate the slits simultaneously. A screen is placed 2.0 m from the slits
At what distance from the central maximum on the screen will a bright fringe from one pattern first coincide with a bright fringe from the other? A) 1.5 mm B) 3.0 mm C) 4.5 mm D) 6.0 mm E) 9.0 mm