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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
Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
Explain how the principle of echo is used by
The dolphin to locate small fish as its prey
Write the approximate value of the speed of sound in iron.
What is meant by echo depth sounding?
Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?
What do you understand by the ‘Echolocation system of Dolphins’?
Name the type of waves that are used for sound ranging. Why are radio waves not audible to us?
Draw a diagram representing a wave of amplitude 4 cm and wavelength 2 m. If the frequency of the wave is 150 Hz, calculate its velocity.
(i) A man stands at a distance of 68 m from a cliff and fires a gun. After what time interval will he hear the echo, if the speed of sound in air is 340 ms−1?
(ii) If the man had been standing at a distance of 12 m from the cliff would he have heard a clear echo?
A sound wave whose frequency is 5000 Hz travels in air and then hits the water surface. The ratio of its wavelengths in water and air is ______.
