A band director instructs students to play a pitch louder. How will the sound wave change when the band plays the same pitch lou
der?
The speed of the sound wave will increase.
The frequency of the sound wave will increase.
The wavelength of the sound wave will increase.
The amplitude of the sound wave will increase.
The speed of the sound wave will increase.
The frequency of the sound wave will increase.
The wavelength of the sound wave will increase.
The amplitude of the sound wave will increase.
2 answers:
Explanation :
Loudness is defined as how our ear perceives the sound. It is basically related to the intensity of a sound wave.
When the same pitch is played louder, its amplitude changes. Amplitude is the maximum displacement covered by a wave.
This is the only difference between the loudness to that of shrillness. The amplitude of the loud sound is more as compared to that of shrill sound.
So, the correct option is (d).
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Answer:
0.214 m
Explanation:
In order for the bag to levitate and not fall down, the electrostatic force between the bag and the balloon must balance the weight of the bag.
Therefore, we can write:
where
k is the Coulomb constant
is the charge on the balloon
is the charge on the bag
r is the separation betwen the bag and the balloon
is the mass of the bag
is the acceleration due to gravity
Solving for r, we find the distance at which the bag must be held: