Question

Calculate the wave speed (in m/s) for the following waves:

a) A sound wave in steel with a frequency of 500 Hz and a wavelength of 3.0 meters. (2pts)







b) a ripple on a pond with a frequency of 2 Hz and a wavelength of 0.4 meters. (2pts)









Calculate the wavelength (in meters) for the following waves:



A wave on a slinky spring with a frequency of 2 Hz travelling at 3 m/s. (2pts)







An ultrasound wave with a frequency 40,000 Hz travelling at 1450 m/s in fatty tissue. (2pts)









Calculate the frequency (in Hz) for the following waves:



A wave on the sea with a speed of 8 m/s and a wavelength of 20 meters. (2pts)







A microwave of wavelength 0.15 meters travelling through space at 300,000,000 m/s. (2pts)

Answer 1

#Wavespeed

#1

`\\ \rm\Rrightarrow v=\\u\lambda=500(3)=1500m/s`

#2

`\\ \rm\Rrightarrow v=2(0.4)=0.8m/s`

#Wavelength

#1

`\\ \rm\Rrightarrow \lambda=(v)/(\\u)=(3)/(2)=1.5m`

#2

`\\ \rm\Rrightarrow \lambda= (1450)/(40000)=0.03625m`

#Frequency

`\\ \rm\Rrightarrow \\u=(v)/(\lambda)=(8)/(20)=0.4Hz`

#2

`\\ \rm\Rrightarrow \\u=(3* 10^8)/(15* 10^(-2))=0.2\timee 10^(10)=2* 10^9Hz`

Answer 2

Answer: A : 250 is the answer

B; The frequency of a wave is the number of complete oscillations (cycles) made by the wave in one second.

Instead, the wavelength is the distance between two consecutive crests (highest position) or 2 troughs (lowest position) of the wave.

In this problem, we are told that the leaf does two full up and down bobs: this means that it completes 2 full cycles in one second. Therefore, its frequency is

where is called Hertz (Hz). So, the correct answer is

Step-by-step explanation: