A metallic coin is given a negative electric charge. Its mass:
1.increases measurably.
2.increases by an amount too small to measure directly.
3.remains unchanged.
4.decreases by an amount too small to measure directly.
5.decreases measurably.
2
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A single slit is illuminated at normal incidence with a parallel beam of light having a wavelength of The entire central band of the diffraction pattern is observed at ±90°
The illumination is now replaced by a nonrelativistic beam of electrons, each having a kinetic energy of 980 eV. When this beam hits the slit at normal incidence, at what angle will the first minimum of the electron diffraction pattern occur? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19 J) A) 0.095 mrad B) 0.071 mrad C) 0.046 mrad D) 0.12 mrad E) 0.14 mrad
Explain why white clothing keeps us cool, whereas black clothing warms us. Which is the better reflector? Which is the better absorber?
What will be an ideal response?
Why do some igneous rocks have no crystals at all?
What will be an ideal response?
The most distant point in the Moon's orbit is called _________________
a. apogee b. perigee c. perihelion d. aphelion