Superposition of Waves
Superposition of Waves
Top questions
See all →- The fundamental frequency of a pipe closed at one end is 250 Hz. The frequency of its first overtone is Answer: D. 750 Hz A closed pipe has only odd harmonics; first overtone =3n=750 Hz. 1
- A tuning fork of frequency 256 Hz produces 4 beats/s with an unknown fork. When the unknown fork is loaded with a little wax (which lowers its frequency), the number of beats becomes 6 per second. The original frequency of the unknown fork is Answer: A. 252 Hz Unknown is 252 or 260 Hz. Loading lowers frequency; beats increase only if it was already below 256, so it is 252 Hz. 1
- A string 1 m long, fixed at both ends, carries transverse waves with speed 200 m/s. The frequency of its second overtone is Answer: A. 300 Hz Fundamental =v/2L=100 Hz; second overtone = third harmonic =300 Hz. 1
- A wave of frequency 500 Hz is travelling with a speed of 350 m/s. Given: n = 500 Hz, v = 350 m/s V = n x λ ∴ λ = 350/500 = 0.7 m (a) in t = 1.0 ms = 0.001 s, the path difference is the distance covered v x... 1
- A sound wave in a certain fluid medium is reflected at an obstacle to form a standing wave. Given : Distance between two successive nodes = λ/2 = 3.75 x 10⁻² m, v =1500 m/s ∴ λ = 7.5 x 10⁻² m v = n x λ ∴ n = v/λ = frac15003.75×10⁻²... 1
- Two sources of sound are separated by a distance 4 m. They both emit sound with the same amplitude and frequency (330 Hz ∴ λ = v/n = 330/330 = 1 m Directly at the cenre of two sources of sound, path difference is zero. But since the waves are 180° out of phase,... 1