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3 cm As the figure show the resultant wave will be : Incident wave A.4cm B. 2cm C. 3cm D.1cm + Reflected wave 1 1 cm As the figure show the resultant wave will be : 15 cm A.4cm B. 10 cm C. 15cm D.20cm 5 cmWhen a 225-g mass is hung from a spring, the spring stretches 9.4 cm. The spring and mass then are pulled 3.0 cm from this new equilibrium position and released. Find the spring constant of the spring and the maximum speed of the mass. k = E = E X X _ (0.225 kg}(9.80 W32) _ 0'094 m 23 Wm Maximum velocity occurs when the mass passes through the equilibrium point, where all the energy is kinetic energy. Using the conservation of energy: PEsp = KEmass 1 2 _ 1 2 2k): 2m\"; 2 = kxz V m _ 'rkxz _ .-'W V _ \\ m x 0.225 kg = 0.81 mis What is the logarithmic scale that Decibels measure the level of measures sound level? variation in _. A) electromagnetic spectrum A) wavelength B) decibel B) temperature C) pressure [2) pressure D) frequency D) frequency The perceived loudness of a sound is measured in A) hertz. A) frequency B) decibels. B) amplitude (2) watts. C) wavelength D) watts per square meter. D) DItCh Sound level is a measure of 14. a. What is the speed of sound of the b. The sound wave has a frequency of C. What is the wave's wavelength? clock's chime in air? 436 Hz. What is the period of the wave? A = v = d T = 1 343 m/s 436 Hz 515 m 1.50 s = 436 Hz = 0.787 m = 343 m/s = 2.29X10-3 s 16. 17. 18. 0.100 s 5 pulses = 0.0200 s/pulse, so f = n 19. T = 0.0200 s A = VT, So A = 1.20 cm 0.0200 s = 60.0 cm/s = 0.600 m/s