Physics
Examine the graph depicting the transmitted (T) and reflected (R) waves from submarines A and B, which are equipped with a device emitting ultrasonic sounds. Study the graph and answer the following. (Speed of sound in water is 1500 m/s)
(a) Name the device used here.
(b) Why is ultrasonic sound used in this device?
(c) Which submarine is closer to the ship? Calculate the distance of the closest submarine.
Related Questions
The circuit depicted in the figure is employed to study Ohm's Law. Rather than employing a conventional resistor, a glass tube of length ‘l’ and cross-sectional area ‘a’, which is half-filled with mercury of resistivity ‘d’, is connected to the circuit via two electrodes, E1 and E2. These electrodes are linked to a battery with an emf of ‘E’ and negligible internal resistance. Provide the answer in terms of ‘a’, ‘l’, ‘d’, and ‘E’.
(a) Resistance of mercury in the tube.
(b) The ammeter reading.
(c) Voltmeter reading.
(d) Which of the measurements are altered when the tube is entirely filled with mercury?
Two students are conducting experiments with identical 100 g mass simple pendulums, each raising the bob 5 m above the mean position. The graph depicting the relationship between distance from the mean position and velocities is presented in the diagram.
(a) Demonstrate, using mathematical calculations, that the path followed by student 1 is devoid of friction.
(b) Does the situation involving student 2 exhibit a breach of the law of conservation of energy?
In the below circuit diagram, calculate the power consumed in the circuit when:
(a) the switch S1 is closed, and the switch S2 is open.
(b) the switch S2 is closed, and the switch S1 is open.
The diagram below shows a pulley used to lift an iron beam of length 3 m and weight 100 kgf, lying on the ground.
(a) Calculate the minimum effort needed to just lift the beam off the ground. [Assume no loss of energy]
(b) When the beam is being lifted from the ground, with the other end touching the ground, state with a reason whether the effort needed keeps on increasing, decreasing or remains constant.