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3 years ago

According to the Doppler effect, the sound of a police car siren is and pitched as it approaches the observer.

2 answers:

8 0

According to the Doppler effect, the sound of a police car siren is louder and high pitched as it approaches the observer.

Ainat [17]3 years ago

3 0

Answer:

On the basis of the Doppler effect, the sound of a police car siren is louder and higher pitched as it move towards the observer.

Explanation:

Whenever the police car with a siren moves towards an individual, the frequency of the siren will increase and the reverse happens when the police car moves away from the person. The individual can listen to the sound of the siren louder and clearer when the car approaches the individual, as the sound is highly pitched when it moves towards the observer. This phenomenon is known as the Doppler effect.

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2 years ago

The cell theory eventually replaced the concept of spontaneous generation as a result of what experimental evidence?

Arisa [49]

Answer:- Option C - evidence that microorganisms cannot grow in boiled broth when new organisms were not allowed to enter.

Explanation:-

Theory of spontaneous generation stated that the living organisms can be created from non living matter. However, this theory was disapproved and replaced by the cell theory which stated that all living organisms are created from cells and new cells arise from pre-existing cells.

There were several experiments conducted by various scientists to disapprove the theory of spontaneous generation however, the experiment that was most successful to do so was the one conducted by Louis Pasteur in 1859.

Description of the experiment:-

-In his experiment, Pasteur boiled a meat broth in a flask (it was known that boiling the broth kills the micro organisms) and then heated the neck of the flask to bend into a S- shape.

The purpose of the S shaped neck was to allow the air to enter into the flask but not the micro-organisms as the micro organisms will settle by gravity in the neck and not reach into the flask.

observations of the experiment :-

1. Pasteur observed that even though the air entered the flask no micro organisms were growing in the flask.

2. Further,when he tilted the flask so that the broth came in contact with the part of the neck where the air borne microorganisms could have settled he was able to observe microbial growth in the flask.

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3 years ago