Q281
Open questionWhy can not the sound is heard on the Moon?
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Physics GK · all questionsSounds waves and Motion
Sounds waves and Motion
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Q282
Open questionSound moves with higher velocity if
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Q283
Open questionA biotechnique in which ultrasonic sound is used
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Q284
Open questionAt 20°C, the speed of sound in water approximately
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Q285
Open questionThe velocity of a wave is frequency (f) and wavelength (λ) ?
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Q286
Open questionWhich of the following has the longest wavelength?
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Q287
Open questionWhich of the following are the characteristics of electromagnetic waves?
1. They are elastic waves.
2. They can also move in vacuum.
3. They have electric and magnetic components which are mutually perpendicular.
4. They move with a speed equal to 3 lakh meters per second.
Select the correct answer:
1. They are elastic waves.
2. They can also move in vacuum.
3. They have electric and magnetic components which are mutually perpendicular.
4. They move with a speed equal to 3 lakh meters per second.
Select the correct answer:
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Q288
Open questionA source of frequency 500 Hz emits waves of 0.4 m wavelength. How long time will it take by the wave to travel 600 meters?
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Q289
Open questionWhat is the repeated reflection of sound from the walls of a large hall, which results in the persistance of sound?
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Q290
Open questionWhich term is not associated with sound wave?
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Q291
Open questionSpeed of sound in seawater . . . . . . . . it occurs.
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Q292
Open questionWhich of the following will have the maximum speed of sound at 25°C?
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Q293
Open questionWhich of the following statements are true/false about the speed of sound in different mediums on 25°C
A. In water (marine), the speed of sound is 1531 m/s.
B. In ethanol, the speed of sound is 1200 km/s.
A. In water (marine), the speed of sound is 1531 m/s.
B. In ethanol, the speed of sound is 1200 km/s.
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Q294
Open questionLongitudinal waves cannot travel through
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Q295
Open questionTo hear different echoes, the minimum distance of obstruction from the source of sound should be . . . . . . . .
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Q296
Open questionThe velocity of a particle performing simple harmonic motion when it passes through its mean position is
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Q297
Open questionThe sounds having a frequency of 20 Hz to 20000 Hz are known as
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Q298
Open questionA maritime survey ship sends a sound wave to the ocean floor, which receives an echo or resonance after 2.5 s. The speed of sound in seawater is 1200 ms-1. What is the depth of the ocean?
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Q299
Open questionWhich of the following statements is correct?
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Q300
Open questionAn astronaut cannot hear his companion ar the surface of the Moon because
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