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A wave in a string has an amplitude of 2cm. The wave travels in the positive direction of x- axis with a speed of 128 m/s and it is noted that 5 complete waves fit in 4 m length of the string. The equation describing the wave is
Options
(a) y = (0.02) m sin (15.7x – 2010t)
(b) y = (0.02) m sin (15.7x + 2010t)
(c) y = (0.02) m sin (7.85x – 1005t)
(d) y = (0.02) m sin (7.85x + 1005t)
Correct Answer:
y = (0.02) m sin (7.85x – 1005t)
Explanation:
A = 2 cm, ? / k = 128 ms, 5λ = 4, λ = 4/5 m.
y = A sin ( kx – ?t),
k = 2π / λ = 2π x 5 / 4 = 31.4 / 4 = 7.85
y = 0.02m sin (7.857 – 1005 t)
? = 128 x 7.85 = 1005
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Topics: Waves
(80)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A tuning fork gives 4 beats with 50 cm length of a sonometer
- On adjusting the P-N junction diode in forward bias,
- If critical angle for a material to air passage is 30°, the refractive index
- 40 g of Argon is heated from 40⁰C to 100⁰C (R=2 cal/mole). Heat absorbed at constant
- A long wire carrying a steady current is bent into a circular loop of one turn.
Topics: Waves (80)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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