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Erythropoietin hormone which stimulates R.B.C. formation is produced by:
A train moving at a speed of $220 \text{ ms}^{-1}$ towards a stationary object, emits a sound of frequency $1000 \text{ Hz}$. Some of the sound reaching the object gets reflected back to the train as an echo. The frequency of the echo as detected by the driver of the train is (speed of sound in air is $330 \text{ ms}^{-1}$)
A tuning fork of frequency $512 \text{ Hz}$ makes $4 \text{ beats/s}$ with the vibrating strings of a piano. The beat frequency decreases to $2 \text{ beats/s}$ when the tension in the piano strings is slightly increased. The frequency of the piano string before increasing the tension was:
Two points are located at a distance of $10 \text{ m}$ and $15 \text{ m}$ from the source of oscillation. The period of oscillation is $0.05 \text{ s}$ and the velocity of the wave is $300 \text{ m/s}$. What is the phase difference between the oscillations of two points?
Each of the two strings of length $51.6 \text{ cm}$ and $49.1 \text{ cm}$ are tensioned separately by $20 \text{ N}$ force. Mass per unit length of both the strings is same and equal to $1 \text{ g m}^{-1}$. When both the strings vibrate simultaneously the number of beats is:
A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of $27^\circ\text{C}$, two successive resonances are produced at $20 \text{ cm}$ and $73 \text{ cm}$ column length. If the frequency of the tuning fork is $320 \text{ Hz}$, the velocity of sound in air at $27^\circ\text{C}$ is:
An element that cannot form [MF6]3- ion is-
Consider the below reaction and identify the missing reagent/chemical. $$CH_3CH_2COO^-Na^+ + NaOH \xrightarrow{?, \ \Delta} CH_3CH_3 + Na_2CO_3$$
The time of reverberation of a room $A$ is one second. What will be the time (in seconds) of reverberation of a room, having all the dimensions double those of room $A$?
The ratio of the dimension of Planck's constant and that of moment of inertia is the dimension of
In Young's double-slit experiment, if there is no initial phase difference between the light from the two slits, a point on the screen corresponding to the fifth minimum has a path difference:
Two coherent sources of light interfere and produce fringe patterns on a screen. For the central maximum, the phase difference between the two waves will be:
After passing through a polarizer, a linearly polarized light of intensity $I$ is incident on an analyser making an angle of $30^{\circ}$ with the axes of the polariser. The intensity of light emitted from the analyser will be:
If the monochromatic source in Young's double slit experiment is replaced by white light, then:
If the screen is moved away from the plane of the slits in Young's double slit experiment, then the:
The Brewster's angle for an interface should be:
In Young's double slit experiment, if the wavelength of light used is increased (say from violet to red) then the:
The dimensional formula of angular velocity is
The dimensional formula for impulse is same as the dimensional formula for
Dimensional formula of heat energy is