Physics-
General
Easy

Question

An Indian submarine and an enemy submarine move towards each other during maneuvers in motionless water in the Indian ocean. The Indian submarine moves at 50 km/h, and the enemy submarine at 70 km/h. The Indian sub sends out a sonar signal (sound wave in water) at 1000 Hz. Sonar waves travel at 5500 km/h. What is the frequency detected by the Indian submarine

  1. 1.02 kHz    
  2. 2 kHz    
  3. 2.5 kHz    
  4. 4.7 kHz    

The correct answer is: 1.02 kHz


    Frequency detected by Indian submarine
    n ´ equals n open square brackets fraction numerator v plus v subscript s u b end subscript over denominator v minus v subscript s u b end subscript end fraction close square brackets equals 1000 open square brackets fraction numerator 5500 plus 50 over denominator 5500 minus 50 end fraction close square brackets almost equal to 1.02 k H z.

    Related Questions to study

    General
    Physics-

    A sound wave of wavelength 32 cm enters the tube at S as shown in the figure. Then the smallest radius r so that a minimum of sound is heard at detector D is

    A sound wave of wavelength 32 cm enters the tube at S as shown in the figure. Then the smallest radius r so that a minimum of sound is heard at detector D is

    Physics-General
    General
    Physics-

    An engine is moving on a circular track with a constant speed. It is blowing a whistle of frequency 500 Hz. The frequency received by an observer standing stationary at the centre of the track is

    An engine is moving on a circular track with a constant speed. It is blowing a whistle of frequency 500 Hz. The frequency received by an observer standing stationary at the centre of the track is

    Physics-General
    General
    Physics-

    Assertion : When a beetle moves along the sand with in a few tens of centimeters of a sand scorpion the scorpion immediately turn towards the beetle and dashes to it
    Reason : When a beetle disturbs the sand, it sends pulses along the sands surface one set of pulses is longitudinal while other set is transverse.

    Assertion : When a beetle moves along the sand with in a few tens of centimeters of a sand scorpion the scorpion immediately turn towards the beetle and dashes to it
    Reason : When a beetle disturbs the sand, it sends pulses along the sands surface one set of pulses is longitudinal while other set is transverse.

    Physics-General
    parallel
    General
    Physics-

    Assertion : On a rainy day sound travel slower than on a dry day.
    Reason : When moisture is present in air the density of air increases.

    Assertion : On a rainy day sound travel slower than on a dry day.
    Reason : When moisture is present in air the density of air increases.

    Physics-General
    General
    Physics-

    Assertion : The basic of Laplace correction was that, exchange of heat between the region of compression and rarefaction in air is not possible.
    Reason : Air is a bad conductor of heat and velocity of sound in air is large.

    Assertion : The basic of Laplace correction was that, exchange of heat between the region of compression and rarefaction in air is not possible.
    Reason : Air is a bad conductor of heat and velocity of sound in air is large.

    Physics-General
    General
    Physics-

    The displacement-time graphs for two sound waves A and B are shown in the figure, then the ratio of their intensities I subscript A end subscript divided by I subscript B end subscript is equal to

    The displacement-time graphs for two sound waves A and B are shown in the figure, then the ratio of their intensities I subscript A end subscript divided by I subscript B end subscript is equal to

    Physics-General
    parallel
    General
    Physics-

    A wave is travelling along a string. At an instant, shape of the string is as shown in fig. At this instant, point A is moving upwards. Which of the following statements is/are correct

    A wave is travelling along a string. At an instant, shape of the string is as shown in fig. At this instant, point A is moving upwards. Which of the following statements is/are correct

    Physics-General
    General
    Physics-

    An observer starts moving with uniform acceleration a toward a stationary sound source emitting a whistle of frequency n. As the observer approaches source, the apparent frequency, heard by the observer varies with time as

    An observer starts moving with uniform acceleration a toward a stationary sound source emitting a whistle of frequency n. As the observer approaches source, the apparent frequency, heard by the observer varies with time as

    Physics-General
    General
    Physics-

    Two tuning forks P and Q are vibrated together. The number of beats produced are represented by the straight line OA in the following graph. After loading Q with wax again these are vibrated together and the beats produced are represented by the line OB. If the frequency of P is 341Hz, the frequency of Q will be

    Two tuning forks P and Q are vibrated together. The number of beats produced are represented by the straight line OA in the following graph. After loading Q with wax again these are vibrated together and the beats produced are represented by the line OB. If the frequency of P is 341Hz, the frequency of Q will be

    Physics-General
    parallel
    General
    Physics-

    If the speed of the wave shown in the figure is 330m/s in the given medium, then the equation of the wave propagating in the positive x-direction will be (all quantities are in M.K.S. units)

    If the speed of the wave shown in the figure is 330m/s in the given medium, then the equation of the wave propagating in the positive x-direction will be (all quantities are in M.K.S. units)

    Physics-General
    General
    Physics-

    Which of the following curves represents correctly the oscillation given by y equals y subscript 0 end subscript sin invisible function application left parenthesis omega t minus phi right parenthesis, where 0 less than phi less than 90

    Which of the following curves represents correctly the oscillation given by y equals y subscript 0 end subscript sin invisible function application left parenthesis omega t minus phi right parenthesis, where 0 less than phi less than 90

    Physics-General
    General
    Physics-

    Figure here shows an incident pulse P reflected from a rigid support. Which one of A, B, C, D represents the reflected pulse correctly

    Figure here shows an incident pulse P reflected from a rigid support. Which one of A, B, C, D represents the reflected pulse correctly

    Physics-General
    parallel
    General
    Physics-

    Fig. below shows the wave y equals A sin invisible function application left parenthesis omega t minus k x right parenthesis at any instant travelling in the +ve x-direction. What is the slope of the curve at B

    Fig. below shows the wave y equals A sin invisible function application left parenthesis omega t minus k x right parenthesis at any instant travelling in the +ve x-direction. What is the slope of the curve at B

    Physics-General
    General
    Physics-

    The diagram below shows the propagation of a wave. Which points are in same phase

    The diagram below shows the propagation of a wave. Which points are in same phase

    Physics-General
    General
    Physics-

    The figure shows four progressive waves A, B, C, and D with their phases expressed with respect to the wave A. It can be concluded from the figure that

    The figure shows four progressive waves A, B, C, and D with their phases expressed with respect to the wave A. It can be concluded from the figure that

    Physics-General
    parallel

    card img

    With Turito Academy.

    card img

    With Turito Foundation.

    card img

    Get an Expert Advice From Turito.

    Turito Academy

    card img

    With Turito Academy.

    Test Prep

    card img

    With Turito Foundation.