Aperiodic wave on a string has a wavelength of 30 cm and a frequency of 2 hz. what is the speed of the wave?
2f
f
f/2
f/3

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.

What is the energy of a photon of ultraviolet radiation with a frequency of 4.4 × 1015 hz? planck’s constant is 6.63 × 10–34

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.