A plate sliding into a(n) ____________________ can trigger volcanism
Fill in the blank(s) with correct word
subduction zone
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Mass Sprectrometer: The figure shows a mass spectrograph that is operated with deuterons, which have a charge of +e and a mass of 3.34 × 10-27 kg. The deuterons emerge with negligible velocity from the source, which is grounded. The speed of the deuterons as they pass through the accelerator grid is 8.0 × 105 m/s. A uniform magnetic field of magnitude B = 0.20 T, directed out of the plane, is present to the right of the grid and is perpendicular to the velocity of the deuterons. The deuterons make a circular orbit in the magnetic field. What is the radius of this orbit, and what is the initial direction of their deflection just as they enter the magnetic field? (e = 1.60 × 10-19 C)
style="vertical-align: 0.0px;" height="219" width="380" /> A. 62 mm, upward B. 71 mm, upward C. 62 mm, downward D. 69 mm, downward E. 84 mm, downward
The Chandrasekhar limit is
A) the upper-mass limit for a white dwarf. B) the temperature at which hydrogen fusion starts. C) the point at which a planetary nebula forms. D) the temperature at which helium fusion starts. E) the lower-mass limit for a Type II supernova.
The radio lobes of active galaxies can span ________ of light-years
A) tens B) hundreds C) thousands D) millions E) billions
A compound microscope consists of an objective lens of focal length f0 and an eyepiece that by itself produces an angular magnification 25.0
The microscope is designed so that the object to be viewed is on the left side of the objective lens and is focused in a plane that is 28.00 cm away from the right-hand (or inside) focal point of the objective lens. When properly adjusted, the eyepiece and the objective lens are 29.90 cm apart. The eyepiece magnification is based on an image at infinity and a near point at 25.0 cm. What is f0?