Periodic Motion, Waves, and Sound

Question 1

Angular frequency of spring

Answer 1

√k/m = 2πƒ

Question 2

Spring potential E

Answer 2

U = 1/2 kx^2

Question 3

Angular frequency of pendulum

Answer 3

√g/L = 2πƒ

Question 4

Pendulum potential E

Answer 4

U = mgh

Question 5

Equation for sound intensity

Answer 5

I = P/A

Question 6

Equation for sound level

Answer 6

ß = 10 log I/Io

Question 7

Doppler equation

Answer 7

ƒ’ = (v ± vd) / (v ± (-vs))

Use + if heading towards the other, - if away

Question 8

Wavelength of standing wave with two closed ends

Answer 8

λ = 2L/n

Question 9

Wavelength of standing wave with two open ends

Answer 9

λ = 2L/n

Question 10

Wavelength of standing wave with one open and one closed end

Answer 10

λ = 4L/n where n=1,3,5…

Question 11

Shortcut to determine harmonic of two closed ends?

Answer 11

Count the antinodes

Question 12

Shortcut to determine harmonic of two open ends?

Answer 12

Count the nodes

Question 13

Shortcut to determine harmonic of one open, one closed end?

Answer 13

Count the nodes, once in each direction