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प्रश्न
A type of electromagnetic wave has a wavelength of 50 Å. Name the wave and state one use of this type of wave.
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उत्तर
X-rays. These are used for determining fracture of bones, hidden objects in customs at Airports.
संबंधित प्रश्न
Why are the ceilings of concert halls curved?
A wave passes from one medium to another medium. Mention one property of the wave out of speed, frequency or wavelength which does not change.
Name two sound absorbing materials (or objects) which can make our big room less echoey.
What is a soundboard ? Explain the working of a soundboard with the help of a labelled diagram.
Explain how is the principle of echo used by
(a) The bat during its flight at night,
(b) The dolphin to locate small fish as its prey.
What are mechanical waves?
What do you mean by reflection of sound? State one condition for the reflection of a sound wave. Name a device in which reflection of sound wave is used.
Why is an echo not heard when the distance between the source of sound and reflection body is less than 10 m?
In what respect does waveforms of noise and a musical note differ. Draw diagrams to illustrate your answer.
