The pitch of an ambulance siren changes as it approaches you. the pitch also changes as the siren moves away from you. which is the scientific term for this occurrence?

The correct answer is "Doppler effect".

Explanation:

Doppler effect: In this phenomenon, there is an apparent change in the frequency of the wave. There is an increase or decrease in the frequency of the wave.

If the source and listener are moving away from each other then there will decrease in the frequency.

If the source and listener are moving towards each other then there will increase in the frequency.

In the given problem, The pitch of an ambulance siren changes as it approaches you. The pitch depends on the frequency. The pitch also changes as the siren moves away from you. There will decrease in the frequency.

Therefore, the correct option is Doppler effect.

when earth is in rotational motion around the sun,it displaces from its place.

when a ball is placed on an inclined surface it does both the rotational and circular motion.

explanation:

0.3x0.21x0.08kg=mass 1 sheet

mass 500 = 500xmass 1

volume pile = 0.3x0.2x0.048

density=mass/volume= 500xmass 1/0.3x0.2x0.048

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