Question

Waves A fisherman notices that wave crests pass the bow of his anchored boat every 3.0 s. He measures the distance between two crests to be 6.5 m. How fast are the waves traveling? 2. A sound wave in air has a frequency of 262 Hz and travels with a speed of 343 m/s. How far apart are the wave crests (compressions)? io signals have frequencies between 550 kHz and 1600 kHz and travel with a speed of 3.00x 108 m/s. What are the wavelengths of these signals? (b) On FM, the frequencies range from 88.0 MHz to 108 MHz and travel at the same speed; what are their wavelengths? violin string vibrates at 440 Hz as its fundamental frequency, what are the frequencies of the first 5. A hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far 6. (a) Calculate the wavelengths in air at 20C for sounds in the maximun range of human hearing, 20 Hz 4 four harmonics? end of the lake. She hears the echo 2.0 s after shouting. Estimate the length of the lake. 1 H ultrasonic waye? What is the intensity of a sound at

1-5 test prep please help

Answer 1

T = 3s lambda = 6.5 m, so v = lambda/T = 6.5/3 = 2.17 m.s 2) V = 262 Hz v = 343 m/s lambda = v/V = 343/262 = 1.31 m