The Sun is on the celestial equator during the:
A) vernal equinox and the summer solstice.
B) autumnal equinox and the vernal equinox.
C) summer solstice and the winter solstice.
D) autumnal equinox and the winter solstice.
B
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An alloy of 80 atomic % arsenic and 20 atomic % gallium is produced, and the alloy is heated to 1250°C to thoroughly melt the mixture. The alloy is then slowly cooled so that it is always close to equilibrium. Answer the following about the alloy:
(a) At what temperature does a solid first form?
(b) What is the chemical composition of the first solid to form?
(c) Below what temperature is the alloy completely solid?
(d) At room temperature (23°C), what phases are present, what are their chemical compositions, and what is the atom fraction of each phase present?
At what wavelength would a star radiate the greatest amount of energy if the star has a surface temperature of 10,000 K?
a. 10 nm b. 100 nm c. 300 nm d. 1.0 × 10^4 nm e. 3.0 × 10^10 nm
Diffraction Gratings: In a diffraction grating experiment, light of 600 nm wavelength produces a first-order maximum 0.35 mm from the central maximum on a distant screen. On the same screen, a second monochromatic source produces a third-order maximum 0.87 mm from the central maximum when it passes through the same diffraction grating. What is the wavelength of the light from the second source?
Fill in the blank(s) with the appropriate word(s).
A rectangular coil of 100 turns measures 40.0 cm by 20.0 cm. This coil is placed next to an electromagnet which is switched on, increasing the magnetic field through the coil from zero to 0.800 T in 50.0 ms. If the resistance of the coil is 2.0 ohms, what are the induced voltage and current in the coil?