Under the same conditions of temperature and presssure, the velocity of sound in oxygen and hydrogen are vo and vH. Then
vo = 4vH
vH = 4vo
vo = vH
vH = 16vo
The load versus elongation graph for four wires of the same materials is shown in the figure. The thinnest wire is represented by the line
OC
OD
OA
OB
One kilogram of ice at 0°C is mixed with one kilogram of water at 80°C. The final temperature of the mixture is (take : specific heat of water = 4200 Jkg-1 K-1, latent heat of ice = 336 kJ kg-1).
40°C
60°C
0°C
50°C
A Carnot's engine is made to work between 200°C and 0°C first and then between 0°C and − 200°C. The ratio of efficiencies of the engine in the two cases is
1 : 1.73
1.73 : 1
1 : 2
1 : 1
Forty one tuning forks are arranged in increasing order of frequencies such that every fork gives 5 beats with the next. The last fork has a frequency that is double the frequency of the first fork is
210
400
205
200
D.
200
f1 = frequency of first fork
f41 = frequency of 41st fork
f41 = 2f1
Between Ist and 41st there are 40 intervals each interval produces 5 beats.
f41 − f1 = 40 × 5
2f1 − f1 = 200
f1 = 200 Hz
In a stationary wave all the particles
in the region between two nodes vibrate in same phase
on either side of a node vibrate in same phase
of the medium vibrate in same phase
in the region between two antinodes vibrate in same phase
A cylindrical tube open at both ends, has a fundamental frequency f0 in air. The tube is dipped vertically into water such that half of its length is inside water. The fundamental frequency of the air column now is
f0
2f0
A man x can hear upto 10 kHz and another man y upto 2 kHz. A note of frequency 500 Hz is produced before them from a stretched string then both will hear sounds of
different pitch but same quality
same pitch but different quality
same pitch and same quality
different pitch and different quality
The equation represents a wave with
amplitude A/2, frequency 2n and wavelength λ
amplitude A/2, frequency 2n and wavelength
amplitude A, frequency n and wavelength λ
amplitude A, frequency 2n, wavelength 2λ
A light points fixed to one prong of a tuning fork touches a vertical plate. The fork is set vibrating and the plate is allowed to fall freely. If eight oscillations are counted when the plate falls through 10 cm, the frequency of the tuning fork is
280 Hz
360 Hz
56 Hz
560 Hz