Amonochromatic plane wave of frequency 50 mhz and average inten- sity 100 w/m2 is propagating vertically downwards in a floating ice slab. the wave encounters the plane interface between the ice and the sea-water below. the relative permittivity of ice at this frequency is 3.2 and its conductivity is negligible. the relative permittivity of sea water at this frequency, at near the conductivity is about 3 s/m. w freezing temperatures, is about 86 and (a) calculate the intensity of the wave which is reflected from the interface (b) calculate the rms amplitude of the electric field of the wave transmitted into the sea water (c) calculate the distance the wave in the sea water travels before its amplitude falls to 10% of the value found in part (b)
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Physics, 22.06.2019 00:00
A1000-kg weather rocket is launched straight up. the rocket motor provides a constant acceleration for 16-s, then the motor stops. the rocket altitude 20-s after launch is 510-m. you can ignore any effects of air resistance. a. what was the rocket’s acceleration during the first 16-s? b. what is the rocket’s speed as it passes through a cloud 5100-m above the ground?
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Physics, 22.06.2019 00:50
Part a constants huck finn walks at a speed of 0.60 m/s across his raft (that is, he walks perpendicular to the raft's motion what is huck's velocity (speed and direction) relative to the river bank? express your answer to three significant figures and include the appropriate units. relative to the shore)
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Which statement correctly describes the relationship between frequency and wavelength?
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Amonochromatic plane wave of frequency 50 mhz and average inten- sity 100 w/m2 is propagating vertic...
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