Questions by varun

0 votes

0 answers

A pipe 20 cm long is closed at one end. Which harmonic mode of the pipe is resonantly excited by a 430 Hz source ? Will the same source be in resonance with the pipe if both ends are open? (speed of sound in air is 340 m

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

Two sitar strings A and B playing the note ‘Ga’ are slightly out of tune and produce beats of frequency 6 Hz. The tension in the string A is slightly reduced and the beat frequency is found to reduce to 3 Hz. If the original frequency of A is 324 Hz, what is the frequency of

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

Explain why (or how): (a) in a sound wave, a displacement node is a pressure antinode and vice versa, (b) bats can ascertain distances, directions, nature, and sizes of the obstacles without any “eyes”, (c) a violin note and sitar note may have the same frequency, yet we can distinguish between the two notes, (d) solids can support both longitudinal and transverse waves, but only longitudinal waves can propagate in gases, and (e) the shape of a pulse gets distorted during propagation in a dispersive

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

A train, standing at the outer signal of a railway station blows a whistle of frequency 400 Hz in still air. (i) What is the frequency of the whistle for a platform observer when the train (a) approaches the platform with a speed of 10 m `s^(–1)`, (b) recedes from the platform with a speed of 10 m `s^(–1)`? (ii) What is the speed of sound in each case ? The speed of sound in still air can be taken as 340 m

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

A train, standing in a station-yard, blows a whistle of frequency 400 Hz in still air. The wind starts blowing in the direction from the yard to the station with a speed of 10 m `s^(–1)`. What are the frequency, wavelength, and speed of sound for an observer standing on the station’s platform? Is the situation exactly identical to the case when the air is still and the observer runs towards the yard at a speed of 10 m `s^(–1)`? The speed of sound in still air can be taken as 340 m

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

A travelling harmonic wave on a string is described by y(x, t) = 7.5 sin (0.0050x +12t + π/4) (a)what are the displacement and velocity of oscillation of a point at x = 1 cm, and t = 1 s? Is this velocity equal to the velocity of wave propagation? (b)Locate the points of the string which have the same transverse displacements and velocity as the x = 1 cm point at t = 2 s, 5 s and 11

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

A narrow sound pulse (for example, a short pip by a whistle) is sent across a medium. (a) Does the pulse have a definite (i) frequency, (ii) wavelength, (iii) speed of propagation? (b) If the pulse rate is 1 after every 20 s, (that is the whistle is blown for a split of second after every 20 s), is the frequency of the note produced by the whistle equal to 1/20 or 0.05 Hz

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

One end of a long string of linear mass density 8.0 × 10–3 kg m–1 is connected to an electrically driven tuning fork of frequency 256 Hz. The other end passes over a pulley and is tied to a pan containing a mass of 90 kg. The pulley end absorbs all the incoming energy so that reflected waves at this end have negligible amplitude. At t = 0, the left end (fork end) of the string x = 0 has zero transverse displacement (y = 0) and is moving along positive y-direction. The amplitude of the wave is 5.0cm. Write

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

A SONAR system fixed in a submarine operates at a frequency 40.0 kHz. An enemy submarine moves towards the SONAR with a speed of 360 km `h^(–1)`. What is the frequency of sound reflected by the submarine ? Take the speed of sound in water to be 1450 m

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

Earthquakes generate sound waves inside the earth. Unlike a gas, the earth can experience both transverse (S) and longitudinal (P) sound waves. Typically the speed of S wave is about 4.0 km `s^(–1)`, and that of P wave is 8.0 km `s^(–1)`. A seismograph records P and S waves from an earthquake. The first P wave arrives 4 min before the first S wave. Assuming the waves travel in straight line, at what distance does the earthquake occur

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

A bat is flitting about in a cave, navigating via ultrasonic beeps. Assume that the sound emission frequency of the bat is 40 kHz. During one fast swoop directly toward a flat wall surface, the bat is moving at 0.03 times the speed of sound in air. What frequency does the bat hear reflected off the wall

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

The two thigh bones (femurs), each of cross-sectional area 10 `cm^2` support the upper part of a human body of mass 40 kg. Estimate the average pressure sustained by the

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

What is the pressure on a swimmer 10 m below the surface of a

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

The density of the atmosphere at sea level is 1.29 kg/`m^3`. Assume that it does not change with altitude. Then how high would the atmosphere

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

At a depth of 1000 m in an ocean (a) what is the absolute pressure? (b) What is the gauge pressure? (c) Find the force acting on the window of area 20 cm × 20 cm of a submarine at this depth, the interior of which is maintained at sealevel atmospheric pressure. (The density of sea water is `1.03 × 10^3` kg `m^(-3)`, g = 10 m

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

Two syringes of different cross-sections (without needles) filled with water are connected with a tightly fitted rubber tube filled with water. Diameters of the smaller piston and larger piston are 1.0 cm and 3.0 cm respectively. (a) Find the force exerted on the larger piston when a force of 10 N is applied to the smaller piston. (b) If the smaller piston is pushed in through 6.0 cm, how much does the larger piston move

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

In a car lift compressed air exerts a force `F_1` on a small piston having a radius of 5.0 cm. This pressure is transmitted to a second piston of radius 15 cm (Fig ). If the mass of the car to be lifted is 1350 kg, calculate `F_1`. What is the pressure necessary to accomplish this task? (g = 9.8 m`s^(-2)`).

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

Blood velocity: The flow of blood in a large artery of an anesthetised dog is diverted through a Venturi meter. The wider part of the meter has a cross sectional area equal to that of the artery.A = 8 `mm^2`. The narrower part has an area a = 4 `mm^2`. The pressure drop in the artery is 24 Pa. What is the speed of the blood in the

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

A fully loaded Boeing aircraft has a mass of `3.3 × 10^5`kg. Its total wing area is 500 `m^2`. It is in level flight with a speed of 960 km/h. (a) Estimate the pressure difference between the lower and upper surfaces of the wings (b)Estimate the fractional increase in the speed of the air on the upper surface of the wing relative to the lower surface. [The density of air is ρ = 1.2 kg

asked Mar 19, 2022 in 11th Physics

0 votes

0 answers

A metal block of area 0.10 `m^2` is connected to a 0.010 kg mass via a string that passes over an ideal pulley (considered massless and frictionless), as in Fig. . A liquid with a film thickness of 0.30 mm is placed between the block and the table. When released the block moves to the right with a constant speed of 0.085 m `s^(-1)`. Find the coefficient of viscosity of the

asked Mar 19, 2022 in 11th Physics

Questions by varun

Categories