Due To Doppler Effect, The Shift In The Wavelength Observed Is 0.1 Å, For A Star Producing A Wavelength 6000 Å. The Velocity Of Recession Of The Star Will Be  

A particle is executing simple harmonic motion along the x-axis with amplitude 4 cm and time period 1.2 s. The minimum time taken by the particle to move from x = +2 cm to x = +4 cm and back again is

Two waves are represented by the following equations:

The ratio of intensities I₂/I₁ will be

The velocity of sound in a diatomic gas is 300 ms^–1. What is the rms velocity of its molecules?  

The length of a sonometer wire AB is 100 cm. Where should the two bridges be placed from end A to divide the wire in three segments whose fundamental frequencies are the ratio of 1:2:3?

A toothed wheel is rotated at 120 r.p.m. A post card is placed against the teeth. How many teeth must the wheel have to produce a note whose pitch is the same as that of a tuning fork of frequency 256 Hz?

If a spring extend by x on loading, then the energy stored in the spring is (T is the tension in the spring and k its force constant)

A pulse travels along a stretched string and reaches the fixed end of the string. It will be reflected back with

At which temperature will the velocity of sound at 27^oC become double?

The equation of a travelling wave is

Where y is the microns, t in seconds and x in metres. The ratio of the maximum particle velocity and velocity of the wave is

A particle, with restoring force proportional to displacement and damping force proportional to velocity is subjected to a force F sin ωt. If the amplitude of the particle is maximum at ω = ω₁ and its energy is maximum at ω = ω₂, then (ω₀ is the angular frequency of natural oscillations of the particle)