Please select a subject first
Advertisements
Advertisements
Two sound notes have wavelengths 83/170 m and 83/172 m in the air. These notes when sounded together produce 8 beats per second. Calculate the velocity of sound in the air and frequencies of the two notes.
Concept: Study of Vibrations of Air Columns
In Doppler effect of light, the term “red shift” is used for ______.
(A) frequency increase
(B) frequency decrease
(C) wavelength decrease
(D) frequency and wavelength increase
Concept: Beats
Two soap bubbles have radii in the ratio 4:3. What is the ratio of work done to blow these bubbles?
Concept: Capillarity and Capillary Action
Define surface tension and surface energy.
Concept: Surface Tension
State the cause of end correction.
Concept: Study of Vibrations of Air Columns
Find the end correction for the pipe open at both the ends in fundamental mode.
Concept: Study of Vibrations of Air Columns
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
