1.

4DA source produces 15 crests and 15 troughs in3 seconds. When the second crest is produced, thefirst is 2 cm away from the source. Calculate (a) thewavelength, (b) the frequency, and (c) the wavespeed.

Answer»

time period T = 1 ÷ frequency sec.

Wavelength = 2 cm.Number of waves produced per second = 15/3= 5.So Frequency = 5 Hz.

Speed of the wave = frequency* wavelength= 5 * 2 = 10 cm/sec.



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