CBSE
Standing waves are formed on a string when interference occurs between two waves having
the same amplitude travelling in the same direction with no phase difference between them
the same amplitude, travelling in the opposite direction with no phase difference between them
different amplitudes travelling in the same direction
different amplitudes travelling in the opposite direction
Intensity of a source of a 100 cd at a distance 2 m is
25 lux
50 lux
75 lux
150 lux
Wavelength of the wave in the above question is
1.7 m
8.5 m
0.85 m
0.17 m
Sound waves produced in gas are
longitudinal
transversal
stationary
progressive
For the stationary wave
The distance between a node and the next antinode is
7.5 cm
15 cm
22.5 cm
30 cm
The length of two open organ pipes are l and (l+ Δl) respectively. Neglecting end corrections the beats frequency between them will be approximately
Relation of wavelengths of sound and light is
λS < λL
λS > λL
λS = λL
None of these
To hear the echo in 1 s, the minimum distance of the source from the reflecting surface should be
28 m
18 m
19 m
165 m
A tuning fork produce 2 beats when sounded with one oscillator of frequency 514 Hz, and produces 6 beats with the other oscillator of frequency 510 Hz. The frequency of tuning fork is
516 Hz
510 Hz
514 Hz
520 Hz
Equation of a progressive sound wave is y = a sin where x in (metre), t (second), then frequency of wave is
200 Hz
400 Hz
500 Hz
600 Hz