PQ 13

Q and A

Q1• Waves in a pond are recorded with the following data: a vertical distance

from high point to low point of 4.6 meters and a horizontal distance of 8.6 meters between adjacent crests. They pass a point every 6.2 seconds. What is the frequency and the speed of these waves?

Q2• A rope attached to a boat and jetty has a length of 4.3 cm. It is vibrating at

its fundamental mode at 250 Hz. What is the length of one wave produced? What is the pitch of the sound produced?

= 8.6 cm

Pitch = 250 Hz

Q3In the spectrum of white light, red colour has a wavelength of 7 x 10-7 m. If the velocity of light is approximately 3 x 108 m/s, what is the frequency of the waves of red colour?

Q4• A Sound wave traveling in air has a

wavelength of 1.6 × 10-2 m. if the Velocity of sound is 320 m/s. Calculate the frequency of the sound?

Q5A gun is fired and the time measured it takes for the sound to hit a reflective wall surface and back to the shooter. How far from the reflective surface is the shooter if the time between when the sound was made and its return was 2.0 s? (speed of sound 335 m s-1.)

Distance = v/t

=335/2

= 335m Therefore: 335/2 = 167.5m

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Q26 continued

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