Apolycrystalline solid: (a) is amorphous (c) is usually anisotropic (b) contains grain boundaries (d) none of these 2. the atomic diameter of an fcc crystal (lattice parameter a) is a2 (c) (b) a2 (d) (1 10) 3. draw the plane whose miller indices are 4. using bohr model of the hydrogen atom, find the largest wavelength of emitted photon when the electron of the hydrogen atom rehurns to its 3 excited state

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

Energy flows from the producer level to the level. is called

The inner planets or call terrestrial because they