A wave has a wavelength of 10 mm and a frequency of 5 hertz. What is its speed?

50 mm/s
50 hertz/s
2 mm/s
0.50 mm/s

How does reflection differ from refraction and diffraction?

Reflection is the only process in which the wave does not continue moving forward.
Reflection is the only process that involves a change in the wave.
Reflection affects all types of mechanical waves, but refraction and diffraction do not.
Reflection is the only process that changes the direction.

Question

A wave has a wavelength of 10 mm and a frequency of 5 hertz. What is its speed?

50 mm/s
50 hertz/s
2 mm/s
0.50 mm/s

How does reflection differ from refraction and diffraction?

Reflection is the only process in which the wave does not continue moving forward.
Reflection is the only process that involves a change in the wave.
Reflection affects all types of mechanical waves, but refraction and diffraction do not.
Reflection is the only process that changes the direction.

anonymous · Answer

$$v=\lambda * \nu $$  

use this..

anonymous · Answer

I don't get what that's supposed to be.

anonymous · Answer

lambda is wavelength 

nu is frequency 

v is speed..

anonymous · Answer

So you're saying it's 50 mm/s?

anonymous · Answer

yep..

anonymous · Answer

That's what I thought. So what's the answer for the second question?

anonymous · Answer

it may be first one .. but i am not sure ..