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Published on: 13/05/2022
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Questions + Answers key
Take MCQ Science Test1.
Name three animals, which can hear ultrasonic vibrations.
2.
What will be the frequency sound having 0.20 m as its wavelength, when it travels with a speed of 331 m s–1?
3.
What is the minimum distance needed for an echo?
4.
What is the audible range of frequency?
5.
What is a longitudinal wave?
1.
Dolphins, dogs, bats can hear the ultrasonic vibrations.
2.
Given: V = 331 ms-1, λ = 0.20 m, n =?
V = n x λ
331 = n(0.20)
n = \(\frac{331}{0.20}\) = 1655 Hz
3.
The minimum distance required to hear an echo is 1/20th part of the magnitude of the velocity of sound in air.
i.e. \(\frac{1}{20} \times 344 = 16.7m\)
4.
(i) The audible range of frequency is 20 Hz to 20,000 Hz.
(ii) These are generated by vibrating bodies such as vocal cords, stretched strings, etc.
5.
If the particles of the medium vibrate along the direction of propagation of the wave, then the waves are said to be longitudinal.
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
