Two observers are stationed in two boats 4.5 km apart. A sound signal sent by one, under water, reaches the other after 3 seconds. What is the speed of sound in the water?

A man is standing between two vertical walls 680 m apart. He claps his hands and hears two distinct echoes after 0.9 se,conds and 1.1 second respectively. What is the speed of sound in the air? Given : Time of first echo, t_i = 0.9 s Time of second echo, t_2 = 1.1 s Distance between man and wall, d = 680 m To find : Speed of sound in air, V = ?

(i)A man is standing between two vertical wall 680 m apart. He claps his hands and hears two distinct echoes after 0.9 seconds and 1.1 seconds respectively .What is the speed of sound in the air ? (ii) An electric heater of resistance 5 Omega is connected to an electric source .If a current of 6 A flows through the heater then find the amount of heat produced in 5 minutes.

An ultrasound signal of frequency 50 kHz is sent vertically into sea water. The signal gets reflected from the ocean bed and returns to the surface 0.80 s after it was emitted. The speed of sound in sea water is 1500ms^-1 . a) Find the depth of the sea. b) What is the wavelength of this signal in water.

A violin player riding on a slow train plays a 440 Hz note. Another violin player standing near the track plays the same note. When the two are close by and the train approaches the person on the ground, he hears 4'0 beats per second. The speed of sound in air = 340 ms^-1 (a) Calculate the speed of the train. (b) What beat frequency is heard by the player in the train ?

Places A and B are 100 km apart on a highway. One car start from A and another from B at the same time at different speeds. If the car travel in the same direction, they meet in 5 hours, if they travel towards each other, they meet in 1 hour. What are the speeds of the two cars?