Answer:
Maximum Power = 144.3 D
The associated focal length of the lens = 
Explanation:
According to the Lens maker's Formula:
where;
= the refractive index of the medium
and 
= radius of curvature on each surface
For a convex lens, The radius of curvature in the front surface will be positive and that of the second surface will be negative . Therefore;
At maximum power
= 
This Implies
Therefore; the power is given by the formula:
= 144.3 D
Answer:
Thermal heat
Explanation:
The water heats up which it means it is thermal (heat/hot)
If an object is at equilibrium, the net force acting upon the object is 0 Newton.
Motion is the process of changing position.
Answer:
The frequency increases with a shorter horn <em>(Option B)</em>.
Explanation:
The length of the horn determines the distance along which the wave travels; simply called the wavelength. Therefore, a short horn tube will produce a short wavelength and vice versa.
Sound waves have various characteristics that define pitches in musical instruments and these characteristics are interdependent on each other.
in this case, the frequency and the frequency and the wavelength are related.
The relationship between the wavelength and its frequency is given as:
<em> </em><em>c = f λ </em><em> </em>
<em>where 'c' is the speed of sound through the instrument; 'f ' is the frequency and 'λ' is the wavelength.</em>
Let's assume that the speed at which the musician blows air into the mouthpiece remains constant, an increase in wavelength will cause a decrease in frequency. Conversely, as the tube of the horn becomes shorter the frequency increases.
