Monday 24 Nov

Target: Understanding Waves

Ch #11:

 

 

 

Transverse Waves:

 

1. In general, sound is conducted from slowest through fastest through (which medians)?

 

1. vacuum,  then cold air, warm air, liquids, solids

 

2. Compared to the velocity of a 400 Hz sound, the velocity of 100 Hz sound through air is:

 

                        Same Velocity! Velocity of sound does not depend on frequency, but on temperature, pressure and density (in a confined space, the speed of sound increases with temperature)

 

3. On a day when the speed of sound in air is 340 m/s, a bat hitting a ball emits a crack whose reaches it 0.50 s later.  How far way was the object that reflected back the sound?

                       

            Dist = (V) (t) with no acceleration

             x =  (340)(0.5) = 170m/s