Required Practical: Measuring Waves on a String

Question 1

Aim of the Waves on a String Experiment?

Answer 1

To measure the frequency, wavelength, and speed of waves on a string.

Question 2

Equipment used for the Waves on a String Experiment?

Answer 2

• signal generator
• vibration generator (transducer)
• string or cord
• wooden bridge
• pulley
• 200 g mass (or similar)
• ruler
• eye protection or safety screen

Question 3

What are the full setup and steps for the Waves on a String experiment?

Answer 3

1. Set up the string attached to a vibration generator. 2. Hook a 200 g mass over a pulley at the other end to pull the string taut.
2. Place a wooden bridge under the string near the pulley.
3. Switch on the signal generator and vibration transducer. The string will start to vibrate.
4. Adjust the frequency on the signal generator until a clear wave pattern or stationary wave appears. The correct frequency depends on the length of the string and the mass used.
5. Measure wavelength, frequency, and wave speed (see next flashcards).
6. Repeat measurements for accuracy and record results clearly.

Question 4

What is the basic method to measure wavelength in the Waves on a String experiment?

Answer 4

1. Measure the length of as many half-wavelengths (loops) as possible.
2. Divide by the number of loops to get the mean half-wavelength
3. Then, double this value to find the full wavelength (λ).

Question 5

What is the accurate method to measure wavelength in the Waves on a String experiment?

Answer 5

1. Measure multiple wavelengths at once (e.g., 4–5 loops) to reduce error.
2. Divide the total measured length by the number of wavelengths to find the average full wavelength.

Question 6

How do you measure frequency in the Waves on a String experiment?

Answer 6

The frequency of the wave is the same as the setting on the signal generator.

Question 7

How do you measure wave-speed in the Waves on a String experiment?

Answer 7

Use frequency and wavelength (see previous steps) to use the formula: v = f x λ

Question 8

What are the main hazard, possible consequences, and control measures in the waves on a string experiment?

Answer 8

• Hazard: cord/string snapping
• Consequence: damage to eyes
• Control Measures: wear eye protection, or use a safety screen

Question 9

What can be done to make the waves on a string experiment more accurate?

Answer 9

• Measure multiple half-wavelengths at once to reduce errors.
• Ensure the string is taut and straight.
• Adjust the wooden bridge if stationary waves are not clear.
• Use consistent mass and string length for reproducibility.