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Doppler effect is not applicable when _______.
(A) source and observer are at rest.
(B) there is a relative motion between source and observer.
(C) both are moving in opposite directions.
(D) both are moving in same direction with different velocities
Concept: Beats
The working of RADAR is based on ...............
a) resonance
b) speed of a star
c) Doppler effect
d) speed of rotation of sun
Concept: Beats
If two capillary tubes of different diameters are partially dipped in the same liquid vertically, then the rise of liquid ______.
Concept: Capillarity and Capillary Action
A sonometer wire vibrates with three nodes and two antinodes, the corresponding mode of vibration is ...................
a) First overtone
b) Second overtone
c) Third overtane
d) Fourth overtone
Concept: Free and Forced Vibrations
Draw a neat labelled diagram of rise of liquid in capillary tube showing different components of tension (force).
Concept: Capillarity and Capillary Action
A tube open at both ends has length 47 em. Calculate the fundamental frequency of air column. (Neglect end correction. Speed of sound in air is 3.3 x 102m/s}
Concept: Study of Vibrations of Air Columns
The total free surface energy of a liquid drop is `pisqrt2` times the surface tension of the liquid. Calculate the diameter of the drop in S.l. unit.
Concept: Surface Tension
Draw neat labelled diagrams for modes of vibration of an air column in a pipe when it is closed at one end.
Hence derive an expression for fundamental frequency in each case.
Concept: Study of Vibrations of Air Columns
A soap bubble of radius 12 cm is blown. Surface tension of soap solution is 30 dyne/cm. Calculate the work done in blowing the soap bubble.
Concept: Capillarity and Capillary Action
In a conical pendulum, a string of length 120 cm is fixed at rigid support and carries a mass
of 150 g at its free end. If the mass is revolved in a horizontal circle of radius 0.2 m around a
vertical axis, calculate tension in the string (g = 9.8 m/s2)
Concept: Surface Tension
A body weighs 4.0 kg-wt on the surface of the Earth. What will be its weight on the surface of a plant whose mass is `1/8` th of the mass of the Earth and radius half `(1/2)` of that of the Earth?
Concept: Surface Tension
Show that the surface tension of a liquid is numerically equal to the surface energy per unit
area.
Concept: Surface Tension
A big drop of radius R is formed from 1000 droplets of water. The radius of a droplet will be _______
A) 10 R
B) R/10
C) R/100
D) R/1000
Concept: Surface Tension
Apparent frequency of the sound heard by a listener is less than the actual frequency of sound emitted by source. In this case _______.
(A) listener moves towards source
(B) source moves towards listener
(C) listener moves away from the source.
(D) source and listener move towards each other.
Concept: Beats
State any two characteristics of the angle of contact
Concept: Surface Tension
Show that only odd harmonics are present in an air column vibrating in a pipe closed at one end.
Concept: Free and Forced Vibrations
A stretched wire emits a fundamental note of frequency 256 Hz. Keeping the stretching force constant and reducing the length of wire by 10 cm, the frequency becomes 320 Hz. Calculate the original length of wire.
Concept: Free and Forced Vibrations
State any four applications of Doppler effect
Concept: Beats
Calculate the work done in increasing the radius of a soap bubble in air from 1 cm to 2 cm. The surface tension of soap solution is 30 dyne/cm. (Π = 3.142).
Concept: Surface Tension
What is meant by harmonics?
Concept: Study of Vibrations of Air Columns
