Construct and calibrate a portable diffraction-grating spectrometer and use it to examine the spectra of several light sources. The maximum peak pressure gain and the maximum loudness by monaural hearing is obtained. Compare single slit diffraction patterns to double-slit patterns. The opposite is true when the head is turned towards the sound source. What is the significance of this value? That is, what kind of perceptual difference might there be between sounds above 2500 Hz and sounds below 2500 Hz? (Hint: Typical humans have two working ears. Measure slit separation using double-slit interference of He-Ne laser light.A shadow is a region behind an obstacle into which a wave does not easily diffract. is most apparent when the size of the obstacle or opening ( a) and the wavelength of the wave ( ) are of the same order ( a ).
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