Name________________________ Worksheet: Waves II Per_____ Givens: Speed of Sound: 340 m/s

Speed of light: c = 3.0 x 108 m/s

1______________

You see a flash of lightning, and 4.0 sec later you hear the thunder. How far away was the lightning flash? (m) Hint: Assume light travels short distances instantaneously; consider only the speed of sound.

2______________

What is the wavelength of an “A” 440 Hz tone? (m)

3______________

What is the frequency of 700 nm red light? (Hz)

4______________

What is the period of the red light in # 3 above? (s)

5______________

What is the optimum length for a ¼ λ antennae for WMGQ 98.3 MHz broadcast out of New Brunswick, NJ ? (m)

6______________

A slinky is attached to the front desk. A student standing 20 ft away oscillates the slinky up and down, forming a wave that has two crests and one trough that oscillate in place. It is noted that 10 cycles are completed in 6.0 sec. What is the velocity of the wave? (ft/s)

An anchored boat is observed to rise and fall through a total range* of 2 m once every 4.0 sec as waves whose crests are 30 m apart pass by. 7______________

What is the frequency of the waves? (Hz)

8______________

What is the velocity of the waves? (m/s)

* Range is defined as the total vertical distance between the two extremes.