- The statement 1 is incorrect because the frequency of a wave produced by a flute is determined by the length of the resonating air column inside the flute, not the overall length of the flute itself. A flute of smaller length actually produces waves of higher frequency.
- The statement 2 is correct. Sound can travel through rocks in the form of longitudinal elastic waves, also known as seismic waves. These waves are generated by earthquakes and other geological processes and can travel through the Earth's crust and interior.
- Therefore, the correct answer is option B, which states that only statement 2 is correct.

Explanation:
1. A flute of smaller length produces waves of lower frequency:
- The frequency of a wave is determined by the number of complete cycles the wave undergoes in a given time period. In the case of a flute, the frequency of the sound produced is determined by the length of the resonating air column inside the flute.
- When a person blows air into a flute, the air column vibrates and produces sound waves. The length of the air column determines the frequency of these waves.
- In a flute of shorter length, the air column is shorter, and therefore, the waves produced have a higher frequency. This is because the shorter air column allows for more cycles of vibration to occur in a given time period, resulting in a higher frequency.
- On the other hand, a flute of longer length has a longer air column, which allows for fewer cycles of vibration in a given time period, resulting in a lower frequency.
- Therefore, statement 1 is incorrect as it states the opposite of what actually happens.

2. Sound travels in rocks in the form of longitudinal elastic waves only:
- Sound is a mechanical wave that requires a medium to travel through. In the case of rocks, sound can travel through them in the form of longitudinal elastic waves.
- Longitudinal waves are waves in which the particles of the medium vibrate back and forth in the same direction as the wave is moving. In the case of rocks, these waves are also known as seismic waves.
- When an earthquake occurs, it generates seismic waves that propagate through the Earth's crust and interior. These waves can travel long distances and are used by scientists to study the Earth's structure and composition.
- Therefore, statement 2 is correct as it accurately describes the propagation of sound waves in rocks.