Question

E: Percussion Pitch (and instruments)
a) True
b) False

Answer 1

i think thst the correct answer is true

Answer 2

These Physics questions address the concepts of pulse waves, superposition of waves, conservation of energy, wave interference, sonic booms, and pitch in wind instruments. The true/false assertions are responded to with explanations pertaining to high school level Physics.

Step-by-step explanation:

The subject of these questions is Physics, specifically focusing on the concepts of waves, energy, and sound. Each question pertains to basic physical principles that are usually covered in High School education.

1. False: A pebble dropped in water is an example of a pulse wave. This is a true statement as a pulse wave refers to a single disturbance moving through a medium, like a pebble creating ripples in water.
2. True: Waves can superimpose if their frequencies are different. This is true. Superposition is the principle that waves can pass through each other and temporarily combine amplitudes without altering the original waves permanently. This can happen regardless of the waves' frequencies.
3. False: If a rock is thrown into the air, the increase in the height would increase the rock's kinetic energy, and then the increase in the velocity as it falls to the ground would increase its potential energy. This statement is false. As the rock rises, its kinetic energy decreases and potential energy increases. Conversely, as it falls, its potential energy decreases, and its kinetic energy increases.
4. False: The amplitude of one wave is affected by the amplitude of another wave only when they are precisely aligned. This statement is false. The amplitude of a wave can be affected by the superposition of another wave, which can happen even if they are not precisely aligned, as long as they intersect.
5. False: The observed frequency becomes infinite when the source is moving at the speed of sound. This statement is false. When a source moves at the speed of sound, a sonic boom is created, and the observed frequency sharply increases but does not become infinite.
6. True: The amplitudes of waves add up only if they are propagating in the same line. This statement is false. While constructive interference is strongest when waves are aligned, waves in different lines can still add up to some degree when they intersect.
7. GRASP CHECK: If you turn up the volume of your stereo, will the pitch change? The correct answer is 'a'. No, because pitch does not depend on intensity. Intensity relates to the energy or amplitude of the wave, while pitch relates to the frequency.

Lastly, regarding wind instruments, by changing the length of the air column, musicians can alter the frequency of the note played, affecting the pitch. Horns that produce very low frequencies, like tubas, have long tubes coiled into loops to fit into a practical space while still producing the desired pitch.