A344-nm thick film coats a glass surface. the indices of refraction of the film and the glass are 1.4 and 1.50, respectively. the surface of the film is illuminated from above at normal incidence with white light.

a) what are the two wavelengths of light in the 400 nm to 800 nm wavelength band that are most strongly reflected? express your answer in nm.

b) what is the wavelength of light in the 400 nm to 800 nm wavelength band that is most weakly reflected? the wavelength of light in the 400 nm to 800 nm wavelength band that is most weakly reflected, in nm.

Wish i knew this to !

The figure is missing but we can answer anyway.the correct answer is "releasing the string". in fact, when the person is holding the bow and the arrow, the kinetic energy of the arrow is still zero (because the arrow is not moving). the moment the arrow is released, it acquires a velocity v, so its kinetic energy will become different from zero: where m is the mass of the arrow and v its velocity.  all the other options, instead, do not increase the kinetic energy of the system: -  pulling farther back on the string : this will just increase the elastic potential energy of the system-  holding the arrow higher: this will increase the gravitational potential energy of the system (which is given by u=mgh, where h is the height above the ground)-  decreasing the mass of the arrow: this will decrease the gravitational potential energy of the system (which is given by u=mgh, where m is the mass)