21. The sound produced by a single frequency is called . . . . . . . .
22. A radio station broadcast at 30 metre band. The frequency of the carrier wave transmitted by this station is
23. A sound wave produced 40 crests and 40 troughs in 0.3 seconds. Find the frequency of the wave.
24. The velocity of sound in air is affected by change in the
1. Moisture content of air.
2. Temperature of air.
3. Composition of air.
4. Atmospheric pressure.
Choose the correct answer.
1. Moisture content of air.
2. Temperature of air.
3. Composition of air.
4. Atmospheric pressure.
Choose the correct answer.
25. We hear other's speaking to us from adjacent rooms due to . . . . . . . . of sound waves.
26. Which of the following statements is true / false about the speed of sound in different mediums at 25°C?
A. In helium gas, the speed of sound is 965 km/s.
B. In hydrogen gas, the speed of sound is 1284 m/s.
A. In helium gas, the speed of sound is 965 km/s.
B. In hydrogen gas, the speed of sound is 1284 m/s.
27. Which type of electromagnetic radiation is used in the remote control of a television?
28. A pendulum clock is lifted to a height where the gravitational acceleration has a certain value of g. Another pendulum clock of same length, but of double the mass of the bob is lifted to another height where the gravitational acceleration is $$\frac{g}{2}$$. The time period of the second pendulum would be (in terms of period T of the first pendulum)
29. Which of the following are false. Sound waves are . . . . . . . . waves.
30. Which of the following electromagnetic wave has the shortest wavelength?
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