Chemistry-
General
Easy
Question
Radioactive disintegration differs from a chemical change in being
- An exothermic change
- A spontaneous process
- A nuclear process
- A unimolecular first-order reaction
The correct answer is: A nuclear process
Radioactive disintegration is a nuclear process
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An Indian submarine is moving in “Arab Sagar” with a constant velocity. To detect enemy it sends out sonar waves which travel with velocity 1050 m/s in water. Initially the waves are getting reflected from a fixed island and the reflected waves are coming back to submarine. The frequency of reflected waves are detected by the submarine and found to be 10% greater than the sent waves.
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Now an enemy ship comes in front, due to which the frequency of reflected waves detected by submarine becomes 21% greater than the sent waves. Bulk modulus of sea water should be approximately (ρwater = 1000 kg/m3)
Physics-General
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Now an enemy ship comes in front, due to which the frequency of reflected waves detected by submarine becomes 21% greater than the sent waves. If the wavelength received by enemy ship is 
´ and wavelength of reflected waves received by submarine is 
then 
equals
An Indian submarine is moving in “Arab Sagar” with a constant velocity. To detect enemy it sends out sonar waves which travel with velocity 1050 m/s in water. Initially the waves are getting reflected from a fixed island and the reflected waves are coming back to submarine. The frequency of reflected waves are detected by the submarine and found to be 10% greater than the sent waves.
Now an enemy ship comes in front, due to which the frequency of reflected waves detected by submarine becomes 21% greater than the sent waves. If the wavelength received by enemy ship is ´ and wavelength of reflected waves received by submarine is then equals
Physics-General
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An Indian submarine is moving in “Arab Sagar” with a constant velocity. To detect enemy it sends out sonar waves which travel with velocity 1050 m/s in water. Initially the waves are getting reflected from a fixed island and the reflected waves are coming back to submarine. The frequency of reflected waves are detected by the submarine and found to be 10% greater than the sent waves.
Now an enemy ship comes in front, due to which the frequency of reflected waves detected by submarine becomes 21% greater than the sent waves. The velocity of enemy ship should be :
An Indian submarine is moving in “Arab Sagar” with a constant velocity. To detect enemy it sends out sonar waves which travel with velocity 1050 m/s in water. Initially the waves are getting reflected from a fixed island and the reflected waves are coming back to submarine. The frequency of reflected waves are detected by the submarine and found to be 10% greater than the sent waves.
Now an enemy ship comes in front, due to which the frequency of reflected waves detected by submarine becomes 21% greater than the sent waves. The velocity of enemy ship should be :
Physics-General
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An Indian submarine is moving in “Arab Sagar” with a constant velocity. To detect enemy it sends out sonar waves which travel with velocity 1050 m/s in water. Initially the waves are getting reflected from a fixed island and the reflected waves are coming back to submarine. The frequency of reflected waves are detected by the submarine and found to be 10% greater than the sent waves.
Now an enemy ship comes in front, due to which the frequency of reflected waves detected by submarine becomes 21% greater than the sent waves. The speed of Indian submarine is
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Now an enemy ship comes in front, due to which the frequency of reflected waves detected by submarine becomes 21% greater than the sent waves. The speed of Indian submarine is
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A driver is riding a car with velocity vC between two vertical walls on a horizontal surface as shown in figure. A source of sound of frequency 'f' is situated on the car. (vc << v, where v is the speed of sound in air) Consider the sound wave observed by the driver directly from car has a wavelength 1 and the sound wave after reflection from wall-1 observed by the driver has wavelength 2 then
A driver is riding a car with velocity vC between two vertical walls on a horizontal surface as shown in figure. A source of sound of frequency 'f' is situated on the car. (vc << v, where v is the speed of sound in air) Consider the sound wave observed by the driver directly from car has a wavelength 1 and the sound wave after reflection from wall-1 observed by the driver has wavelength 2 then
Physics-General
Physics-
A driver is riding a car with velocity vC between two vertical walls on a horizontal surface as shown in figure. A source of sound of frequency 'f' is situated on the car. (vc << v, where v is the speed of sound in air) Beat frequency observed by the driver corresponding to sound waves reflected from wall-1 and wall-2 (reflected waves corresponding to waves directly coming from source) :
A driver is riding a car with velocity vC between two vertical walls on a horizontal surface as shown in figure. A source of sound of frequency 'f' is situated on the car. (vc << v, where v is the speed of sound in air) Beat frequency observed by the driver corresponding to sound waves reflected from wall-1 and wall-2 (reflected waves corresponding to waves directly coming from source) :
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Statement 1 : Doppler formula for sound wave is symmetric with respect to the speed of source and speed of observer
Statement 2 : Motion of source with respect to stationary observer is not equivalent to the motion of an observer with respect to a stationary source.
Statement 1 : Doppler formula for sound wave is symmetric with respect to the speed of source and speed of observer
Statement 2 : Motion of source with respect to stationary observer is not equivalent to the motion of an observer with respect to a stationary source.
Physics-General
