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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
- The moment of inertia of a semicircular ring about the centre is
- The current in the coil of inductance 5H decreases at the rate of 2 A/s
- A conveyor belt is moving at a constant speed of 2 m/s. A box is gently dropped on it
- A small rod of bismuth is suspended freely between the poles of a strong electromagnet.
- A rod of 10 cm length is moving perpendicular to uniform magntic field of intensity
Topics: Waves (80)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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