Wave Motion Flashcards Preview

Physics > Wave Motion > Flashcards

Flashcards in Wave Motion Deck (19):
1

What the the two types of waves ?

Transverse waves and longitudinal waves

2

What an you say about transverse waves ?

Transverse wave is the one in which the oscillations of y are perpendicular to wave velocity. Electromagnetic waves are transverse in nature.

3

What can you say about longitudinal waves ?

A longitudinal wave is the one in which oscillations o u are parallel to the wave velocity. Sound Waves are longitudinal in nature.

4

What is the general eq of wave motion ?

y=f(ax±bt)

5

What is the formula of wave speed ?

Wave speed v = coefficient of t/ coefficient of x= b/a

6

What is the formula of angular frequency ω?

T= 2π/ω
ω=2πf
f=1/T =ω/2π

7

What is the formula of wave number k?

Wave number k= 2π/λ
where λ=wave length.

8

What is the formula of wave speed ?

Wave speed v = ω/k= fλ

9

What is the phase difference of one particle at a time interval ?

Δδ=ω(t1~t2)
Δδ=2π/T * ΔT

10

What is the phase difference at one time between two particles at a path difference of delta x?

Δδ= 2π/λ . Δx

11

What is the formula of energy density u?

Energy density u= 1/2pω²Α²= energy of oscillations per unit volume

12

What is the formula of power P of wave motion?

Power P = 1/2pω²Α²Sv= energy transferred per unit time

13

What is the formula of intensity in wave motion ?

Intensity I= 1/2pω²Α² v= energy transferred per unit time per unit area

14

What is the phase difference of longitudinal wave ?

π/2

15

What is the speed of transverse wave on a stretched wire v?

v =
√T/μ=√T/pS

16

What is the speed v of longitudinal wave ?

v = (E/p)^1/2

17

What is the Young's modulus of elasticity in solids?

In solids , E=Y= Young's modulus of elasticity
v= (Y/p)^1/2

18

What is the adiabatic bulk modulus of elasticity according to Laplace correction ?

v=
√γRT/M

19

What is the effect of temperature , pressure and relative humidity in speed of sound in air or in gas ?

With temperature v≈√T
Pressure has no effect as long as temperature remains constant and with increase in relative humidity , air density extended and speed of sound increases.