Answer:
The value is 
Explanation:
From the question we are told that
The sound level is 
The distance from the source is d = 1 m
The number of sources is n = 18
Generally the sound which the person is been exposed to is mathematically represented as
=> 
=>
Answer:
convex lens
Explanation:
An image is form in retina with light rays converging most at cornea and upon entering and existing the lens.Rays from top and bottom of the object are traced and produce an inverted image on the retina
Answer:
14.7 m
Explanation:
It would fall 14.7 m in 3 s . You multiply 4.9 by 3.
Answer:
Electromagnetic
Explanation:
Electromagnetic waves are those waves that do not require any material medium for propagation. They arise from a vibration of electric and magnetic fields.
The electromagnetic spectrum is comprised of many waves. One of the waves in the spectrum is visible light.
Visible light is in turn composed of seven different wavelengths of which green light is one of them. Hence, green light travels by electromagetic wave.
Answer: The object acceleration also doubles.
Explanation:
Force is a product of mass of an object and its acceleration.
i.e Force = Mass x Acceleration
Let assume for an object
Force applied = ? (unknown value)
Mass of object = K
Acceleration = N
Then, Force = Mass x Acceleration
Force = K x N
Force = KN
However, if the net force is doubled (i.e Force becomes 2KN from 2 x KN), find acceleration
Again, Force = Mass x Acceleration
2KN = K x ?
? = 2KN/K
? = 2N
Now, acceleration is 2N which indicates that it has also doubled. (since it was N before)
Thus, if the net force acting on an object doubles, the object acceleration also doubles.
