Underline your answer for each situation: If you advance the movie one frame, the knot at point A would be a) in the same place b) higher c) lower d) to the right e) to the left If the person generates a new pulse like the first but more quickly, the pulse would be a) same size b) wider c) narrower If the person generates another pulse like the first but he moves his hand further, the pulse would be a) same size b) taller c) shorter If the person generates another pulse like the first but the rope is tightened, the pulse will move a) at the same rate b) faster c) slower Now the person moves his hand back and forth several times to produce several waves. You freeze the movie and get this snapshot. Underline your answer for each situation: If you advance the movie one frame, the knot at point A would be a) in the same place b) higher c) lower d) to the right e) to the left If you advance the movie one frame, the pattern of the waves will be relative to the hand. a) in the same place b) shifted right c) shifted left d) shifted up e) shifted down If the person starts over and moves his hand more quickly, the peaks of the waves will be a) the same distance apart b) further apart c) closer together If you lower the frequency of a wave on a string you will lower its speed. b) increase its wavelength. c). lower its amplitude. d) shorten its period.

a) correct answer is b higher , b) correct answer is b higher , c) correct answer is b faster , d)  traveling wave , e)

Explanation:

A traveling wave is described by the expression

            y = A sin (kx - wt)

where k is the wave vector and w is the angular velocity

let's examine every situation presented

a) a new faster pulse is generated

A faster pulse should have a higher angular velocity

equal speed is related to the period and frequency

            w = 2π f = 2π / T

therefore in this case the period must decrease so that the angular velocity increases

the correct answer is c narrower

b) Generate a pulse, but move your hand more.

Moving the hand increases the amplitude (A) of the pulse

the correct answer is b higher

c) generates a pulse but the force is tightened

Set means that more tension force is applied to the string, so the velicate changes

       v = √ (T /μ)

the correct answer is b faster

d) move your hand back and forth

in this case you would see a pulse series whose sum corresponds to a traveling wave

e) Advance a frame the movie

in this case the wave will be displaced a whole period to the right

the correct answer is b

f) move your hand faster

the waves will have a maximum fast, so they are closer

answer C

g) decrease wave frequency

Since the speed of the wave is a constant m ak, decreasing the frequency must increase the wavelength to keep the velocity constant.

the correct answer is b increases its wavelength

15.3 cos 65 degrees trig