Please select a subject first
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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
Show that only odd harmonics are present as overtones in the case of an air column vibrating in a pipe closed at one end.
Concept: Study of Vibrations of Air Columns
When a sparingly soluble substance like alcohol is dissolved in water, surface tension of water
Concept: Surface Tension
Obtain an expression for the rise of a liquid in a capillary tube.
Concept: Capillarity and Capillary Action
Show that even as well as odd harmonics are present as overtones in the case of an air column vibrating in a pipe open at both the ends.
Concept: Study of Vibrations of Air Columns
A wheel of moment of inertia 1 kg.m2 is rotating at a speed of 30 rad/s. Due to friction on the axis, it comes to rest in 10 minutes. Calculate the average torque of the friction.
Concept: Study of Vibrations of Air Columns
Choose the correct option:
A standing wave is produced on a string clamped at one end and free at the other. The length of the string ______.
Concept: Speed of Wave Motion
The energy stored in a soap bubble of diameter 6 cm and T = 0.04 N/m is nearly ______.
Concept: Surface Tension
Why is the surface tension of paints and lubricating oils kept low?
Concept: Surface Tension
How much amount of work is done in forming a soap bubble of radius r?
Concept: Surface Tension
Answer in brief:
State the characteristics of stationary waves.
Concept: Stationary Waves
Derive an expression for the equation of stationary wave on a stretched string.
Concept: Stationary Waves
Explain how vibrating strings can be verified using a sonometer.
Concept: Sonometer
A wave of frequency 500 Hz is traveling with a speed of 350 m/s. (a) What is the phase difference between two displacements at a certain point at times 1.0 ms apart? (b) what will be the smallest distance between two points which are 45° out of phase at an instant of time?
Concept: Speed of Wave Motion
A violin string vibrates with fundamental frequency of 440Hz. What are the frequencies of the first and second overtones?
Concept: Harmonics and Overtones
The string of a guitar is 80 cm long and has a fundamental frequency of 112 Hz. If a guitarist wishes to produce a frequency of 160 Hz, where should the person press the string?
Concept: The Speed of a Travelling Wave
Insect moves over the surface of water because of ______.
Concept: Surface Tension
The surface tension of a liquid at critical temperature is ______
Concept: Surface Tension
Explain the phenomena of surface tension on the basis of molecular theory.
Concept: Surface Tension
