Which of these would most likely cause a sound wave?

a-cookies baking
b-milk standing in the bottle
c-a spoon hitting the side of a bowl while mixing
d-butter melting

Answer;

C. a spoon hitting the side of a bowl while mixing

Explanation;

A sound wave is the pattern of disturbance caused by the movement of energy traveling through a medium (such as air, water, or any other liquid or solid matter) as it propagates away from the source of the sound.

The source is some object that causes a vibration, such as a ringing telephone, or a person's vocal chords.

For example; a spoon hitting the side of a bowl while mixing, produces a sound wave due to the vibration caused by the spoon hitting the walls of the bowl.

0.19 m/s and 0.45 m/s

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.