21. Which of the following are electromagnetic waves?
22. What is the approximate speed of sound in distilled water at 25°C (77°F)?
23. If T is the time period of an oscillating pendulum, then which one of the following statement is not correct?
24. The time period of a sound wave is 0.01 seconds. Find its frequency (in Hz).
25. How much should minimum distance be between the source of sound and reflecting surface, so that an echo can be heard clearly?
26. Which of the following statements are true/false about the speed of sound in different mediums at 25°C?
A. In seawater, the speed of sound is 1531 km/s.
B. In water (distilled), the speed of sound is 1498 km/s.
A. In seawater, the speed of sound is 1531 km/s.
B. In water (distilled), the speed of sound is 1498 km/s.
27. Which type of sound waves can propagate in solids?
28. Sound wave in air is
29. When a stone is dropped on the surface of still water, the waves produced are
30. If the frequency of a sound wave is 50 hertz, find its time period.
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