A tuning fork is used to produce sound waves with a frequency of 440 Hz, the tuning reference note. What is the wavelength (in m) of the sound waves when the sound speed is
345 m/s?
A. 0.78
B. 0.92
C. 1.07
D. 1.28
E. 1.46

Ascientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making it look rainbow-like (an effect known as iridescence). she aims a spectrometer at a particular spot and measures the wavelength to be 750 nm (in air). the index of refraction of water is 1.3