Which property of waves allows you to hear someone talking around the corner of

Question

   Which property of waves allows you to hear someone talking around the corner of a building?
    refraction
    diffraction
    interference
    dispersion
    the doppler effect

    Which property of waves allows you to hear beats when tuning an instrument?
    refraction
    diffraction
    interference
    dispersion
    the doppler effect

    A bat (at rest) uses high frequency sound waves to "see." Assume the sound waves have frequency of 40,000Hz and move with a speed of 343m/s in air. What is the wavelength of this sound?
    2.3 mm
    4.2 mm
    5.7 mm
    7.0 mm
    8.6 mm

    The bat "sees" an insect by detecting it with its sound waves. If the sound takes .3 s total time to travel to the insect and then return to the bat after they bounce off the insect, how far away is the insect?
    46.9 m
    51.5 m
    60.2 m
    78.1 m
    106.3 m

    If the sound waves return at a frequency of 39,000Hz what direction is the insect moving?
    away from the bat
    toward the bat
    it is not moving!

    How fast is the insect moving?
    1.80 m/s
    2.55 m/s
    3.81 m/s
    4.34 m/s
    5.67 m/s

Explanation / Answer

Which property of waves allows you to hear someone talking around the corner of a building?
    refraction
    diffraction
    interference
    dispersion
    the doppler effect

    Which property of waves allows you to hear beats when tuning an instrument?
    refraction
    diffraction
    interference
    dispersion
    the doppler effect

    A bat (at rest) uses high frequency sound waves to "see." Assume the sound waves have frequency of 40,000Hz and move with a speed of 343m/s in air. What is the wavelength of this sound?

L = V/f

    2.3 mm
    4.2 mm
    5.7 mm
    7.0 mm
    8.6 mm

    The bat "sees" an insect by detecting it with its sound waves. If the sound takes .3 s total time to travel to the insect and then return to the bat after they bounce off the insect, how far away is the insect?

d = V*t/2 = 343*.3/2
    46.9 m
    51.5 m
    60.2 m
    78.1 m
    106.3 m

    If the sound waves return at a frequency of 39,000Hz what direction is the insect moving?
    away from the bat
    toward the bat
    it is not moving!

    How fast is the insect moving?
    1.80 m/s
    2.55 m/s
    3.81 m/s
    4.34 m/s
    5.67 m/s

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