The relationship between loudness L and intensity I is given as:

1. L = k log₁₀ I
2. L = k log_e I
3. L = k/log₁₀ I
4. none of the above

1 dB is defined as the increase in the level of loudness when the intensity of the sound increases by :

1. 20%
2. 25%
3. 26%
4. 10%

Two sounds of the same loudness and same pitch produced by two different instruments differ in their

1. amplitudes
2. frequencies
3. wave forms
4. all the above

Instruments A and B are producing sounds of the same amplitude, same waveform but frequencies F and 2F respectively. Which of the following statements is correct ?

1. both A and B differ in quality
2. B is grave but A is shrill
3. A is grave but B is shrill
4. B is louder than A