Why does a siren have a higher pitch as it approaches you?

The crests of the sound wave are spaced closer together.

The amplitude of the sound wave is increased.

The troughs of the sound wave are farther apart.

The period of the sound wave is increased.

Question

Why does a siren have a higher pitch as it approaches you?

The crests of the sound wave are spaced closer together.

The amplitude of the sound wave is increased.

The troughs of the sound wave are farther apart.

The period of the sound wave is increased.

Tattyspur · Answer

im pretty sure its the 1st one but i want to check.

Tattyspur · Answer

pls answer anyone pls

Ashely · Answer

$\color{#0cbb34}{\text{Originally Posted by}}$ @Tattyspur
im pretty sure its the 1st one but i want to check.
$\color{#0cbb34}{\text{End of Quote}}$
I think that is right. I literally just learned this in science

nettym · Answer

I would also agree with the first one.

Tattyspur · Answer

ok. thanks everyone and my psbf