Name two animals which can produce infrasonic waves.
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Why are sound waves known as mechanical waves?
Sound waves are called mechanical waves because it requires material medium to propagate. Sound is produced by the vibration of objects. When objects vibrate, it collides with the molecules in the...
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Why are sound waves called mechanical waves?
Sound waves are called mechanical waves because they need a material medium to travel.
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What are infrasonic and ultrasonic sounds?
Infrasonic sound has frequency less than 20 Hz and ultrasonic sound has frequency higher than 20 kHz.
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What are ultrasonic waves? Name one animal which emits ultrasonic waves and explain how it uses the waves?
Ultrasonic waves are those waves which have frequency more than 20 kHz. Bats use ultrasonic waves to fly and search for their prey at night without colliding. Bat produces ultrasound waves in...
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Transgenic animals are the animals in which a foreign gene is expressed.Such animals can be used to study the fundamental biological process
Study basic biological process- how gene are regulated, how they affect the normal functions of the body and its development. Transgenic cow, Rosie is the example for the second category.
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Transgenic animals are the animals in which a foreign gene is expressed.
Study basic biological process- how gene are regulated, how they affect the normal functions of the body and its development. Transgenic cow, Rosie is the example for the second category
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(a) You have learnt that plane and convex mirrors produce virtual images of objects. Can they produce real images under some circumstances? Explain.
(a) Yes Plane and convex mirrors can produce real images as well. If the object is virtual, i.e., if the light rays converging at a point behind a plane mirror (or...
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Two sine waves travel in the same direction in a medium. The amplitude of each wave is A and the phase difference between the two waves is 120°.
The correct answer is (a) A EXPLANATION: The resultant amplitude y = A sin(⍵t-kx) + A sin(⍵t-kx+120°) →y = 2A Sin(⍵t-kx+60°)*cos60° →y = A sin(⍵t-kx+60°) Hence the resultant amplitude is A.
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Two sound waves move in the same direction in the same medium. The pressure amplitudes of the waves are equal but the wavelength,
The correct answer is (a) P1= P2 EXPLANATION: Let the cross-section area = A, if the intensity of the first wave at this cross-section = I₁ and of the second wave =...
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Two sources are called coherent if they produce waves (a) of equal wavelength
(d) having a constant phase difference. EXPLANATION: By definition, the two sources are called coherent if the initial phase difference does not change with time i.e. the phase difference remains constant.
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