Q5. Secret waves: A secret device consists of a wave source with the power output P = 500 kW emitting waves of frequency 200 Hz and the amplitude A in all directions (in 3 dimensions). a) At what distance from the source is the intensity I = 5 x 10-5 W/m²? b) The power decreases by 70% and the amplitude increases by 30%. What is the frequency of the source now? c) For the power P we consider a detector with an area 1m² at the distance 500 m from the source. How much energy from waves do we detect in 5 seconds?
Q5. Secret waves: A secret device consists of a wave source with the power output P = 500 kW emitting waves of frequency 200 Hz and the amplitude A in all directions (in 3 dimensions). a) At what distance from the source is the intensity I = 5 x 10-5 W/m²? b) The power decreases by 70% and the amplitude increases by 30%. What is the frequency of the source now? c) For the power P we consider a detector with an area 1m² at the distance 500 m from the source. How much energy from waves do we detect in 5 seconds?
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Transcribed Image Text:Q5. Secret waves: A secret device consists of a wave source with the power output P = 500 kW
emitting waves of frequency 200 Hz and the amplitude A in all directions (in 3 dimensions).
a) At what distance from the source is the intensity I = 5 x 10-5 W/m²?
b) The power decreases by 70% and the amplitude increases by 30%. What is the frequency of
the source now?
c) For the power P we consider a detector with an area 1m² at the distance 500 m from the
source. How much energy from waves do we detect in 5 seconds?
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