The ability of a steel to be hardened to a specific depth is the _________.
Fill in the blank(s) with the appropriate word(s).
hardenability
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In a mass spectrometer where ions are fired at a given speed perpendicular to the magnetic field, what would be the ratio r20/r22 of the radii of the paths for singly-ionized neon atoms of masses 20 u and 22 u?
1.100/121 2.10/11 3.11/10 4.121/100
A 20 solar mass star will stay on the main sequence for 10 million years, yet its iron core can exist for only a:
A) day. B) week. C) month. D) year. E) century.
A photocathode having a work function of 2.8 eV is illuminated with monochromatic electromagnetic radiation whose photon energy is 4.0 eV
What is the threshold (cutoff) frequency for photoelectron production? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s) A) 6.8 × 1014 Hz B) 2.9 × 1014 Hz C) 7.7 × 1014 Hz D) 8.6 × 1014 Hz E) 9.7 × 1014 Hz
Earth's internal layers were discovered by studying the propagation of P- and S- waves through Earth's interior. In comparison to P-waves, the movement of S-waves are
A) faster and compresses and expands the rock as they move through it. B) faster and vibrates rock particles up and down and side-to-side. C) slower and can travel through solid granite, magma, water or air. D) slower and they can only travel through solids, not liquids.