A musical tone sounded on a piano has a frequency of 874000 Hz and a wavelength of 2 m. What is the speed of the sound wave? use the equation from the power point 1.74E6 m/s 4.56E6 m/s 1.28E6 m/s 7.54E6 m/s

Unpolarized light whose intensity is 1.19 w/ is incident on a polarizer. (a) what is the intensity of the light leaving the polarizer? (b) if the analyzer is set at an angle of = 41.0∘ with respect to the polarizer, what is the intensity of the light that reaches the photocell?

Argon, neon, and xenon are examples of

First answer marked as brainiest which is the correct equation describing the first law of thermodynamics? a) when the internal energy of a system changes, it equals the amount of heat added plus the work done. b) when work is done by the piston, it is equal to the heat added plus the change in internal energy of the system. c) when heat is added to the system, it is equal to the amount of work done by the piston plus the change in internal energy of the system.