Read the following Assertion and Reason carefully and select the correct answer:
1. Assertion: Increasing the amplitude of a sound wave while keeping its frequency unchanged makes the sound louder.
Reason: Frequency is the physical quantity mainly associated with the loudness of a sound.
Reason: Frequency is the physical quantity mainly associated with the loudness of a sound.
2. Assertion: A sound of very large amplitude can still have a low pitch.
Reason: Pitch depends primarily on frequency, while amplitude is mainly related to loudness.
Reason: Pitch depends primarily on frequency, while amplitude is mainly related to loudness.