Intensity is what we commonly call Volume, sound waves with no intensity or volume wouldn´t be hearable by humans, so the statement would be True, Sound waves must have intensity if a person is to hear them. The most usual unit to measure sound intencity is Decibels, and a person with good ears can hear up to -15 dB.
The correct choice is Buffers.
Buffers contains both acids and bases in equilibrium.when base is added to buffers, they adjust the pH value by releasing hydrogen ions.when acid is added to buffers, they adjust the pH value by consuming hydrogen ions. hence these substances resist any change in their pH value by releasing or absorbing hydrogen ions.This process keeps the pH value constant.
It depends upon the sunlight intensity known as ALBEDO, the amount of energy used by photosynthesis and the chemical composition of corn.
Albedo is a measure of the amount of light reflected from an object. Albedo is normally expressed as a decimal value representing the percentage of light reflected.
Photosynthesis, a biological process, uses the energy of sunlight to manufacture sugar, which serves as the universal food for life. Oxygen produced as a product of photosynthesis is released into the environment.
The formula for this reaction is:
6CO2 + 6H2O + sunlight energy → C6H12O6 + 6O2
• where CO2 represents carbon dioxide
• H2O represents water
• C6H12O6 represents the sugar molecules (carbohydrate)
• and O2 represents oxygen
Average speed is greater than average velocity. Average velocity is zero.
Average speed is calculated by:
Distance is the length of the total path traveled.
Average velocity is given by:
Displacement = final position - initial position.
Since, final position =initial position, Displacement = 0, therefore, average velocity = 0
It can be concluded that average velocity is zero and average speed is greater than average velocity.
Answer: Option (B) is the correct answer.
When a person without any selfish motive does something for the benefit of others then it is known as altruism.
For example, a person organizes a food stall every weekend for the poor people of a village.
Therefore, we can conclude that an action that benefits others but not ourselves is an example of altruism.
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