Changes are heard when the doppler effect occurs.

Pitch changes are heard when the Doppler effect occurs.    

Step-by-step explanation:

we have to tell what changes are heard when the Doppler effect occurs.

The Doppler effect is the change in wavelength or frequency of wave in relation to an observer who is moving relative to the wave source.

An increase or decrease in the frequency of sound, light, or the other waves as source and the observer move towards or away from each other. This effect causes the sudden change in pitch.

The very common example for Doppler effect for sound is

You hear the high pitch of the siren of approaching ambulance and notice that its pitch drops suddenly as the ambulance passes you. That is called the Doppler effect.

Hence, Pitch changes are heard when the Doppler effect occurs.

geometric series converge the common ratio r has magnitude less than one.

which is equivalent to

for the example we need

|2-x| < 1

-1 < 2-x   and 2-x < 1

x < 3 and x > 1

we can write that

answer: 1 < x < 3

1a. common ratio r=250/25=10 > 1     diverges

1b.   r=50/100=1/2 converges

when these converge they converge to

where a is the first term.

answer: 200

1c. r=-1   so it's not the case that |r| < 1.     diverges

2a. x is the common ratio so we converge when |x|< 1

2b.   r=-10x / -2 = 5x.

we converge when

|5x| < 1

|x| < 1/5

2c.   r=3-2x

-1 < 3-2x and 3-2x < 1

-4 < -2x and 2 < 2x

x < 2 and 1 < x

1 < x < 2

2d. [/tex] r=-48x^3/12 = 4x^3[/tex]

|4x^3| < 1

|x^3| < \frac 1 4

|x| < 4^{-1/3}

no idea

step-by-step explanation: