Question 1 (1 point) A wave on a string has an equation x = (0.25 metres) cos (21x-23t) . What does the value 23 rad/s represent in this equation? The frequency, f The amplitude The wavenumber k The wavelength The angular frequency w Question 2 (1 point) A noise has an intensity of (5.3x10^-8) W/m . If the threshold of human hearing lo = 1.0x10-12 W/m, calculate the sound intensity level in dB Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10