Please help in all 3 sections! When a is with a particular wire vibrating frequency of...

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Question

Please help in all 3 sections!

Answer 1

Answer #1

Question 1 :

using v = f $\lambda$ , here v is speed of wave , $\lambda$ is wavelength and f is frequency

so v = 29*10^-2*4 = 1.16 m/sec

Question 2 :

wavelength of detected wave = $\lambda$ = v/f

$\lambda$ = 419/(50.7*10³) m

$\lambda$ = 8.2643*10^-3 m = 0.826 cm

so it can detect minimum 0.826 cm size insect.

Question 3 :

He will detect the flash immediatly.

Distance = speed of sound*time taken by sound

d = 343*4.86 = 1666.98 m

Answer 2

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