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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.
उत्तर
X-rays. These are used for determining fracture of bones, hidden objects in customs at Airports.
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संबंधित प्रश्न
The human ear can detect continuous sounds in the frequency range from 20 Hz to 20,000 Hz. Assuming that the speed of sound in air is 330 ms1 for all frequencies; calculate the wavelengths corresponding to the given extreme frequencies of the audible range
A certain sound has a frequency of 256 hertz and a wavelength of 1.3 m.
1) Calculate the speed with which this sound travels
2) What difference would be felt by a listener between the above sound and another sound traveling at the same speed, but of wavelength 2.6 m?
Name two sound absorbing materials (or objects) which can make our big room less echoey.
When a sound is made from a distance of 18 m, in front of a tall building, it is found to get repeated again. Which phenomenon is associated with this observation? Give a brief explanation of this phenomenon?
Why is an echo not heard when the distance between the source of sound and reflection body is less than 10 m?
What is meant by an echo? Explain.
