T. a) What is the speed of sound in air in a freezer if the temperature of the freezer is 40F ? [3] 305.6 mfs . b) What are the nominal lower and upper limits on the frequency of SOUND that are audible to the human ear at room temperature? Lower: upper: [2] 20 Hz [2] 20 000 Hz c) Does temperature affect the frequencies that the human ear can hear? (yeso): [1] No . d) What is the wavelength of the SOUND in the above freezer for the limits of audible sound: for the lower frequency ? for the upper frequency? [2] 15.3 m [2] .0153 m e) An FM radio station broadcasts its signal over an electromagnetic wave with a frequency of 91.1 MHZ. What is the wavelength for this electromagnetic wave? [2] 3.29 m f) An AM radio station broadcasts its signal over an electromagnetic wave with a frequency of 600 kHz. Is the wavelength for this wave longer, the same, or shorter than for the FM radio station of part e? [1] longer . 8 Consider a speaker that produces a sound of frequency 3,300 Hz. (In parts a and b, consider the air to be still - no wind, and consider the speed of sound in the air to be 340 mfs.) All answers for a, b, and c should be to the nearest Hz. a) Suppose that you are stationary and the speaker moves towards you at a speed of 22 m/s. What frequency will you now measure for the sound? [4] 3,523 Hz . b) Suppose that the speaker is held stationary, and you head away from the speaker at a speed of 33 mls. What frequency will you measure for the sound? [4] 2,930 Hz . c) Suppose that the speaker of frequency 3,300 Hz is mounted on a train that is leaving the station going North at 22 mls, you are approaching the station and the front of the train going South at a speed of 33 m/s, and there is an South wind (blowing from the South towards the North) at a speed of 15 m/s (relative to the station). What will you measure for the frequency of the sound [you must be precise: answer to the closest Hz]? [4] 3,345 Hz