| ⇦ | 
| ⇨ |
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
Related Questions: - An electric motor runs on DC source of emf 200 V and draws a current of 10 A.
- The kinetic energy of an electron in the first excited state is
- If by mistake voltmeter is connected in series and ammeter in parallel then
- Number of electrons in one mC charge, given e=1.6×10⁻¹⁹ C, will be
- If the angular momentum of any rotating body increase by 200 % , then the increase
Topics: Waves
(80)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- An electric motor runs on DC source of emf 200 V and draws a current of 10 A.
- The kinetic energy of an electron in the first excited state is
- If by mistake voltmeter is connected in series and ammeter in parallel then
- Number of electrons in one mC charge, given e=1.6×10⁻¹⁹ C, will be
- If the angular momentum of any rotating body increase by 200 % , then the increase
Topics: Waves (80)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply