Stationary and Progressive waves

Question 1

How are stationary waves formed

Answer 1

Wave of constant phase difference and frequency is reflected and the two progressive waves pass through each other

Question 2

Progressive wave

Answer 2

A wave that travels continuously in a medium without change in direction and constant amplitude

Question 3

Fundamental mode of vibration

Answer 3

First harmonic or half a wavelength

Question 4

Nodes

Answer 4

points of zero displacement

Question 5

Antinodes

Answer 5

Points of maximum amplitude

Question 6

Distance between two nodes

Answer 6

half wavelength

Question 7

Do stationary waves that vibrate freely transfer energy to their surroundings

Answer 7

No, as amplitude of vibration is 0 at nodes so there’s no energy. The antinodes have maximum energy but as they are in fixed positions there is no energy transferred

Question 8

Antiphase

Answer 8

When the waves move 1/4 cycle the waves cancel each other out through destructive interference of the points of maximum displacement of each wave

Question 9

pitch

Answer 9

Corresponds to frequency, so can be altered by changing the tension of a string