Doppler effect is the compression or extension of a sound wave, which causes a change in its wavelength / frequency (and so its sound).
Explanation: It is defined as the effect produced by a moving source of waves in which there is an upward shift in frequency for observers, the source is moving towards and downward shift of frequency from which the source is moving away. used to tell if an object in space is moving toward or away from us.
It is important to record all accidents and breakages that occur in the laboratory to prevent them from happening again.
<h3>What is laboratory accident?</h3>
Laboratory accident is defined as the type of accident that occurs in the laboratory leading to harm.
Example of laboratory accidents include the following:
- inhalation of toxic fumes,
- absorption of chemicals through the skin, and
- ingestion of toxic chemicals.
A record of these type of laboratory accidents would hel prevent it's reoccurrence.
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The charge : 2-
The identity - Sulfur ion
Answer:
<u>A. Skin</u>
Explanation:
Skin unlike teeth, bones & shells is fragile & get decomposed easily under the soil.
Answer:
The answer is digital divide.
Explanation:
Digital divide is the answer because if there is only one-fifth of the world that has computers then the United Nations cannot communicate with everyone ,so there is a digital divide and that is your answer. Also, I took the test and I got the question right.
