Physics
A bat emits ultrasonic sound of frequency 1000 kHz in air. If the sound meets a water surface, what is the wavelength of (a) the reflected sound. (b) the transmitted sound? Speed of sound in air is 340 m/s and in water 1486 m/s .
13
Nov
A bat emits ultrasonic sound of frequency 1000 kHz in air. If the sound meets a water surface, what is the wavelength of (a) the reflected sound. (b) the transmitted sound? Speed of sound in air is 340 m/s and in water 1486 m/s . A bat emits ultrasonic sound of frequency 1000 kHz in [...]
Use the formula v = √γP/ρ to explain why the speed of sound in air (a) is independent of pressure ? (b) increases with temperature ? (c) increases with humidity ?
13
Nov
Use the formula v = √γP/ρ to explain why the speed of sound in air (a) is independent of pressure ? (b) increases with temperature ? (c) increases with humidity ? Use the formula v = √γP/ρ to explain why the speed of sound in air (a) is independent of pressure ? (b) increases with [...]
A steel wire has a length of 12.0 m and a mass of 2.10 kg. What should be the tension in the wire so that speed of a transverse wave on the wire equals the speed of sound in dry air at 20^∘C = 343 m/s :
13
Nov
A steel wire has a length of 12.0 m and a mass of 2.10 kg. What should be the tension in the wire so that speed of a transverse wave on the wire equals the speed of sound in dry air at 20^∘C = 343 m/s : A string of mass 2.50 kg is under [...]
A stone dropped from the top of a tower of height 300 m high splashes into the water of a pond near the base of the tower. When is the splash heard at the top given that the speed of sound in air is 340 m/s ? (g = 9.8 ms^− 2 )
13
Nov
A stone dropped from the top of a tower of height 300 m high splashes into the water of a pond near the base of the tower. When is the splash heard at the top given that the speed of sound in air is 340 m/s ? (g = 9.8 ms^− 2 )
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, how long does he disturbance take to reach the other end ?
13
Nov
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, how long does he disturbance take to reach the other end ? A string of mass 2.50 kg is under a [...]
(i) A giant refracting telescope at an observatory has an objective lens of focal length 15 m . If an eyepiece of focal length 1.0 cm is used, what is angular magnification of the telescope ? (ii) If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens ? the diameter of the moon is 3.48×10^6 m, and the radius of lunar orbit is 3.8×10^8 m.
13
Nov
(i) A giant refracting telescope at an observatory has an objective lens of focal length 15 m . If an eyepiece of focal length 1.0 cm is used, what is angular magnification of the telescope ? (ii) If this telescope is used to view the moon, what is the diameter of the image of the [...]
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(i) A giant refracting telescope at an observatory has an objective lens of focal length 15 m . If an eyepiece of focal length 1.0 cm is used ,
and the radius of lunar orbit is 3.8×10^8 m. ,
what is angular magnification of the telescope ? (ii) If this telescope is used to view the moon ,
what is the diameter of the image of the moon formed by the objective lens ? the diameter of the moon is 3.48×10^6 m ,
A small telescope has an objective lens of focal length 144cm and an eyepiece of focal length 6.0 cm. What is the magnifying power of the telescope? What is the separation between the objective and the eyepiece?
13
Nov
A small telescope has an objective lens of focal length 144cm and an eyepiece of focal length 6.0 cm. What is the magnifying power of the telescope? What is the separation between the objective and the eyepiece? A mass attached to a spring is free to oscillate A prism is made of glass of unknown [...]
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A mass attached to a spring is free to oscillate ,
A prism is made of glass of unknown refractive index. A parallel beam of light incident on a face of the prism. By rotating the prism ,
A small candle ,
In Millikan's oil drop experiment ,
The cylindrical tube of a spray pump has a cross-section of 8.0 cm^2 one end of which has 40 fine holes each of diameter 1.0 mm. If the liquid flow inside the tube is 1.5 m min^−1 ,
Two narrow bores of diameters 3.0mm and 6.0 mm are joined together to form a U-shaped tube open at both ends. If the U-tube contains water ,
what is the speed of ejection of the liquid through the holes ? ,
with angular velocity ω ,
A person with a normal near point (25 cm) using a compound microscope with objective of focal length 8.0 mm and an eyepiece of focal length 2.5 cm can bring an object placed at 9.0 mm from the objective in sharp focus. What is the separation between the two lenses? Calculate the magnifying power of the microscope.
13
Nov
A person with a normal near point (25 cm) using a compound microscope with objective of focal length 8.0 mm and an eyepiece of focal length 2.5 cm can bring an object placed at 9.0 mm from the objective in sharp focus. What is the separation between the two lenses? Calculate the magnifying power of [...]
Tags:
A mass attached to a spring is free to oscillate ,
A prism is made of glass of unknown refractive index. A parallel beam of light incident on a face of the prism. By rotating the prism ,
A small candle ,
In Millikan's oil drop experiment ,
The cylindrical tube of a spray pump has a cross-section of 8.0 cm^2 one end of which has 40 fine holes each of diameter 1.0 mm. If the liquid flow inside the tube is 1.5 m min^−1 ,
Two narrow bores of diameters 3.0mm and 6.0 mm are joined together to form a U-shaped tube open at both ends. If the U-tube contains water ,
what is the speed of ejection of the liquid through the holes ? ,
with angular velocity ω ,
What is the focal length of a convex lens of focal length 30 cm in contact with a concave lens of focal length 20cm? Is the system a converging or a diverging lens? Ignore thickness of the lenses.
13
Nov
What is the focal length of a convex lens of focal length 30 cm in contact with a concave lens of focal length 20cm? Is the system a converging or a diverging lens? Ignore thickness of the lenses. What is the focal length of a convex lens of focal length 30 cm in contact with [...]
An object of size 3.0 cm is placed 14cm in front of a concave lens of focal length 21cm. Describe the image produced by the lens. What happens if the object is moved further away from the lens?
13
Nov
An object of size 3.0 cm is placed 14cm in front of a concave lens of focal length 21cm. Describe the image produced by the lens. What happens if the object is moved further away from the lens? An object of size 3.0 cm is placed 14cm in front of a concave lens of focal [...]