When a certain amount of blue light and red light shine on a metal surface, only blue light produces an electric current. Write a paragraph describing how increasing the intensity of each light will affect the amount of current produced. How does quantization help explain these observations?

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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

Which of the following is a measure of the amount of light a star directly emits?               a.  luminosity    b.  intensity    c.  wavelength    d.  brightness