Physics
A short pulse of white light is incident from air to a glass slab at normal incidence. After traveling through the slab, the first colour to emerge is
19
Nov
A short pulse of white light is incident from air to a glass slab at normal incidence. After traveling through the slab, the first colour to emerge is A short pulse of white light is incident from air to a glass slab at normal incidence. After traveling through the slab the first colour to emerge [...]
The near vision of an average person is 25cm. To view an object with an angular magnification of 10, what should be the power of the microscope ?
19
Nov
The near vision of an average person is 25cm. To view an object with an angular magnification of 10, what should be the power of the microscope ? The near vision of an average person is 25cm. To view an object with an angular magnification of 10 what should be the power of the microscope [...]
Will the focal length of a lens for red light be more, same or less than that for blue light ?
19
Nov
Will the focal length of a lens for red light be more, same or less than that for blue light ? same or less than that for blue light ? Will the focal length of a lens for red light be more November 19, 2020 Category: Chapter 9 - Ray Optics and Optical Instruments , [...]
A car is moving with a constant speed of 60kmh^−1 on a straight road. Looking at the rear view mirror, the driver finds that the car following him is at a distance of 100m and is approaching with a speed of 5kmh^−1. In order to keep track of the car in the rear, the driver begins to glance alternatively at the rear and side mirror of his car after every 2s till the other car overtakes. If the two cars were maintaining their speeds, which of the following statement (s) is/are correct ?
19
Nov
A car is moving with a constant speed of 60kmh^−1 on a straight road. Looking at the rear view mirror, the driver finds that the car following him is at a distance of 100m and is approaching with a speed of 5kmh^−1. In order to keep track of the car in the rear, the driver [...]
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A car is moving with a constant speed of 60kmh^−1 on a straight road. Looking at the rear view mirror ,
the driver begins to glance alternatively at the rear and side mirror of his car after every 2s till the other car overtakes. If the two cars were maintaining their speeds ,
the driver finds that the car following him is at a distance of 100m and is approaching with a speed of 5kmh^−1. In order to keep track of the car in the rear ,
which of the following statement (s) is/are correct ? ,
The direction of a ray of light incident on a concave mirror is shown by PQ while directions in which the ray would travel after reflection is shown by four rays marked 1,2,3 and 4. Which of the four rays correctly shows the direction of reflected ray ?
19
Nov
The direction of a ray of light incident on a concave mirror is shown by PQ while directions in which the ray would travel after reflection is shown by four rays marked 1,2,3 and 4. Which of the four rays correctly shows the direction of reflected ray ? 2 3 and 4. Which of the [...]
A SONAR system fixed in a submarine operates at a frequency 40.0kHz. An enemy submarine moves towards the SONAR with a speed of 360 kmh^−1. What is the frequency of sound reflected by the submarine ? Take the speed of sound in water to be 1450 ms^−1.
13
Nov
A SONAR system fixed in a submarine operates at a frequency 40.0kHz. An enemy submarine moves towards the SONAR with a speed of 360 kmh^−1. What is the frequency of sound reflected by the submarine ? Take the speed of sound in water to be 1450 ms^−1. A string of mass 2.50 kg is under [...]
One end of a long string of linear mass density 8.0 ×10^−3 kg/m 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 5.0 cm. Write down the transverse displacement y as function of x and t that describes the wave on the string :
13
Nov
One end of a long string of linear mass density 8.0 ×10^−3 kg/m 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 [...]
A travelling harmonic wave on a string is described by y(x,t) = 7.5sin(0.0050x + 12t + π/4) (a) what are the displacement and velocity of oscillation of a point at x = 1cm, and t = 1s ? Is this velocity equal to the velocity of wave propagation ? (b) Locate the point of the string which have the same transverse displacement and velocity as x=1cm point at t=2s,5s and 11s.
13
Nov
A travelling harmonic wave on a string is described by y(x,t) = 7.5sin(0.0050x + 12t + π/4) (a) what are the displacement and velocity of oscillation of a point at x = 1cm, and t = 1s ? Is this velocity equal to the velocity of wave propagation ? (b) Locate the point of the [...]
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5s and 11s. ,
A travelling harmonic wave on a string is described by y(x ,
and t = 1s ? Is this velocity equal to the velocity of wave propagation ? (b) Locate the point of the string which have the same transverse displacement and velocity as x=1cm point at t=2s ,
t) = 7.5sin(0.0050x + 12t + π/4) (a) what are the displacement and velocity of oscillation of a point at x = 1cm ,
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 . 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 ? The speed of sound in still air can be taken as 340 m/s
13
Nov
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 . What are the frequency, wavelength, and speed of sound for an observer standing on the station’s platform ? [...]
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A string of mass 2.50 kg is under a tension of 200 N. The length of the stretched string is 20.0 m. If the transverse jerk is struck at one end of the string ,
A train ,
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 . What are the frequency ,
how long does he disturbance take to reach the other end ? ,
standing in a station yard ,
wavelength ,
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 (b) recedes from the platform with a speed of 10 m/s ? (ii) what is the speed of sound in each case? The speed of sound in still air can be taken as 340 m/s
13
Nov
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 (b) recedes from the platform with a speed of [...]