1 ) The equation of a wave is y(x, t) = (3.1 cm) sin ( p / 1.6 cm ( x-(66 cm /s ) t.

(a) Find the amplitude. unit in cm.

(b) Find the wavelength of this wave. unit in cm

2 ) At a baseball game, a spectator is 60.0 m away from the batter. How long does it take the sound of the bat connecting with the ball to travel to the spectator's ears? The air temperature is 25.0° C. unit in ms

3 ) A lightning flash is seen in the sky and 8.3 s later the boom of the thunder is heard. The temperature of the air is 24° C.

(a) What is the speed of sound at that temperature? [Hint: Light is an electromagnetic wave that travels at a speed of 3.00 108 m/s.]

(b) How far away is the lightning strike? unit in km


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