Cengage JEE Mains Physics by B.M Sharma

A sound wave of wavelength λ travels towards the right horizontally with a velocity V. It strikes and reflects from a vertical plane surface, travelling at a speed v towards the left. The number of positive crests striking in a time interval of 3 s on the wall is A sound wave of wavelength λ [...]

The equation of a stationary wave is y=0.8cos ( 20/πx )sin200πt where x is in cm and t is in seconds. The separation between consecutive nodes is The equation of a stationary wave is y=0.8cos ( 20/πx )sin200πt where x is in cm and t is in seconds. The separation between consecutive nodes is October [...]

On sounding fork A with another tuning fork B of frequency 384 Hz,6beats are produced per second .After loading the prongs of A with wax and then sounding it again with B,4 beats are produced per second. What is the frequency of the tuning fork A. 4 beats are produced per second. What is the [...]

The equation of displacement of two waves are given as y1=10sin(3πt + π/3),y2 = 5[sin3πt + 3–√cos3πt] Then what is the ratio of their amplitudes The equation of displacement of two waves are given as y1=10sin(3πt + π/3) y2 = 5[sin3πt + 3–√cos3πt] Then what is the ratio of their amplitudes October 29, 2020 Category: [...]

A source of sound of frequency f1 is placed on the ground. A detector placed at a height is released from rest on this source. The observed frequency f(Hz) is plotted against time t(sec) . The speed of sound in air is 300m/s. Find f1 (g=10m/s^2). A stationary observer receives a sound of frequency = [...]

A stationary observer receives a sound of frequency = 2000Hz. The variation of apparent frequency and time is shown in figure. Find the speed of source, if velocity of sound is = 300m/s A stationary observer receives a sound of frequency = 2000Hz. The variation of apparent frequency and time is shown in figure. Find [...]

Source and observer start moving simultaneously along x and y-axis respectively. The speed of source is twice the speed of observer, V0 . If the ratio of observed frequency to frequency of the source is 0.75, find the velocity of sound find the velocity of sound Source and observer start moving simultaneously along x and [...]

Length of a string of density ρ and Young’s modulus Y under tension is increased by 1/n times of its original length If the velocity of transverse and longitudinal vibration of the string is same, find the value of such velocity. find the value of such velocity. Length of a string of density ρ and [...]

When a source moves away from a stationary observer, the frequency is 6/7 times the original frequency. Given: speed of sound =330 m/s . The speed of the source is the frequency is 6/7 times the original frequency. Given: speed of sound =330 m/s. The speed of the source is When a source moves away [...]

In a sports meet the timing of a 200 m straight dash is recorded at the finish point by starting an accurate stop watch on hearing the sound of starting gun fired at the starting point. The time recorded will be more accurate October 29, 2020 Category: Cengage JEE Mains Physics by B.M Sharma , [...]