A string of length 1 m mass 5 g is fixed at both ends. The tension in the string is 8.0 N. The string is set into vibration using an external vibrator of frequency 100 Hz. The separation between successive nodes on the string is close to

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JEE Mains Previous Paper 1 (Held On: 10 Jan 2019 Shift 1)
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  1. 16.6 cm
  2. 33.3 cm
  3. 10.0 cm
  4. 20.0 cm

Answer (Detailed Solution Below)

Option 4 : 20.0 cm
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JEE Main 04 April 2024 Shift 1
90 Qs. 300 Marks 180 Mins

Detailed Solution

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Concept:

Velocity 'v' of the wave on the string is given by,

Where, T = tension and μ = mass per unit length

Wavelength of the wave on the string,

Calculation:

Given,

Length of the string, l = 1 m

Mass of the string, m = 5 g

String Tension = 8.0 N

Frequency of the vibration = 100 Hz

Substituting the given values, we get,

∴ v = 40 ms-1

Wavelength of the wave on the string,

Where, f = frequency of wave

⇒ λ = 0.4 × 102 cm

∴ λ = 40 cm

∴ Separation between two successive nodes is,

∴ d = 20.0 cm

Therefore, the separation between successive nodes on the string is close to 20.0 cm.

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