1 If groups of pulses form waves and the speed of all the pu

1. If groups of pulses form waves and the speed of all the pulses you generated in the coil are the same then the speed of all the waves generated in the coil should be (the same, different).

2. The speed of any wave in any medium is equal to the frequency of the wave times its wavelength. All the waves that you generated in the spring travel at the same speed. Does it follow from these two facts that high frequency waves must have short wavelengths while low frequency waves must have long wavelengths?

3. A pulse reflected from a rigid medium undergoes (no change in phase, a 180 change in phase).

4. A pulse reflected from a medium less rigid than the one in which it has been traveling undergoes (no change in phase, a 180 change in phase).

Solution

1.Different

2.Yes

3. A rigid medium boundary, the displacement remains zero and the reflected wave changes its polarity [undergoes a 180^o phase change]

4.A medium less rigid boundary, the restoring force is zero and the reflected wave has the same polarity and no phase change