15: Standing Waves

Question 1

both ends open, wavelength formula

Answer 1

L = n λ/2
f_n=nf_1

Question 2

both ends fixed, wavelength formula

Answer 2

L = n λ/2
f_n=nf_1

Question 3

one end free, another fixed formula

Answer 3

L = (2n-1)λ/4
f_n=(2n-1)f_1

Question 4

Where are antinodes located?

Answer 4

λ/2

Question 5

Standing wave definition

Answer 5

A standing wave is formed when two identical waves travelling in opposite directions interfere and superimpose. Unlike travelling waves, standing waves do not transfer energy

Question 6

Superposition?

Answer 6

the sum of individual displacements of the travelling waves

Question 7

Destructive interference?

Answer 7

When two travelling waves are out of phase (have the opposite phase or have the phase difference of pi)

Question 8

Constructive interference? Anti-nodes?

Answer 8

When two travelling waves have the same phase (have the phase difference of 0). Anti-nodes have the largest amplitude

Question 9

What do points on standing wave have in common and different?

Answer 9

Same frequency, different amplitude