Physics-
General
Easy
Question
A source having frequency f and a detector are projected in the same vertical plane as shown in the figure. Maximum frequency recored by the detector during flight is (2V0
velocity of sound in air)
- 3f
- none of these
The correct answer is:
Related Questions to study
physics-
An equilateral triangle ABC is formed by joining three rods of equal length and D is the mid point of AB . The coefficient of linear expansion for AB is 
and for AC and BC is 
Find the relation between and , if distance DC remain constant for small changes in temperature
An equilateral triangle ABC is formed by joining three rods of equal length and D is the mid point of AB . The coefficient of linear expansion for AB is and for AC and BC is Find the relation between and , if distance DC remain constant for small changes in temperature
physics-General
physics-
In the adjacent figure, sini/sinr :
In the adjacent figure, sini/sinr :
physics-General
physics-
A narrow monochromatic beam of light of intensity I is incident on a glass plate as shown in figure. Another identical glass plate is kept close to the first one and parallel to it. Each glass plate reflects 25% of the light incident on it and transmits the remaining. Then the ratio of the maximum to minimum intensities in the interference pattern formed by the two beams obtained after one reflection at each plate is
A narrow monochromatic beam of light of intensity I is incident on a glass plate as shown in figure. Another identical glass plate is kept close to the first one and parallel to it. Each glass plate reflects 25% of the light incident on it and transmits the remaining. Then the ratio of the maximum to minimum intensities in the interference pattern formed by the two beams obtained after one reflection at each plate is
physics-General
physics-
A light ray is incident on a glass slab as shown in figure If the refractive index of glass is varying , which of the following figures shows the correct path of light ray .
A light ray is incident on a glass slab as shown in figure If the refractive index of glass is varying , which of the following figures shows the correct path of light ray .
physics-General
physics-
By what angle mirror M2 is rotated, so that the light ray after reflection from both the mirrors become horizontal .
By what angle mirror M2 is rotated, so that the light ray after reflection from both the mirrors become horizontal .
physics-General
physics-
If the air curtain of thickness 't' is made in the water The shift produced by the air curtain is
If the air curtain of thickness 't' is made in the water The shift produced by the air curtain is
physics-General
physics-
In the given figure, the angle of reflection is
In the given figure, the angle of reflection is
physics-General
physics-
In the above question, the approximate 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 
= 1.2 kg/m3 (Ignore the small height difference between the top and bottom side)
In the above question, the approximate 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 = 1.2 kg/m3 (Ignore the small height difference between the top and bottom side)
physics-General
physics-
A cube of density r floats in liquid A of density 
and partly in liquid B of density 
, as shown in figure. The volume of cube immersed in liquid A is less than the volume immersed in liquid B. Then
A cube of density r floats in liquid A of density and partly in liquid B of density , as shown in figure. The volume of cube immersed in liquid A is less than the volume immersed in liquid B. Then
physics-General
physics-
The figure shown a semi-cylindrical massless gate pivoted at the point O holding a stationary liquid of density r. A horizontal force F is applied at its lowest position to keep it stationary The magnitude of the force is
The figure shown a semi-cylindrical massless gate pivoted at the point O holding a stationary liquid of density r. A horizontal force F is applied at its lowest position to keep it stationary The magnitude of the force is
physics-General
physics-
The following figure depict the circular motion The radius of the circle, the period of revolution, the initial position and the sense of revolution are indicated on the figure The simple harmonic motion of the x-projection of the radius vector of the rotating particle P is
The following figure depict the circular motion The radius of the circle, the period of revolution, the initial position and the sense of revolution are indicated on the figure The simple harmonic motion of the x-projection of the radius vector of the rotating particle P is
physics-General
physics-
Four massless springs of force constant 2K, 2K, K and 2K are connected to a mass M lying on a smooth horizontal surface as shown in the figure. If the mass M is displaced horizontally through a small distance and released, the system will oscillate with a frequency
Four massless springs of force constant 2K, 2K, K and 2K are connected to a mass M lying on a smooth horizontal surface as shown in the figure. If the mass M is displaced horizontally through a small distance and released, the system will oscillate with a frequency
physics-General
physics-
The springs in fig. A and B are similar but length in A is three times each of that in B The ratio of period TA/TB is
The springs in fig. A and B are similar but length in A is three times each of that in B The ratio of period TA/TB is
physics-General
physics-
Block A in the figure is released from rest when the extension in the spring is x0 The maximum downward displacement of the block is :
Block A in the figure is released from rest when the extension in the spring is x0 The maximum downward displacement of the block is :
physics-General
physics-
A particle is moving in a force field given by potential 
from the point (1, 1, 1) to (2, 3, 4). The work done in the process is
A particle is moving in a force field given by potential from the point (1, 1, 1) to (2, 3, 4). The work done in the process is
physics-General
