The frequency of the wave increases. The speed and wavelength of the wave will A

Question

The frequency of the wave increases. The speed and wavelength of the wave will A) increase, increase B) stay constant, decrease C) stay constant, increase. D) increase, constant Which of the following is the lowest temperature? A) 0 degree C B) 55 degree F C) 300 degree K D) All the same temperature A ball is slightly larger than a hole in a ring when both are at the same temperature. If both the ball and ring are cooled. What must be true of the coefficients thermal expansion of the ball and the ring if the ball is to fall through the hole? A) The ball has a larger coefficient. B) The ring has a larger coefficient C) Both objects have the same coefficient. D) Not enough information While a solid changes into a liquid, the temperature of the A) solid and liquid are the same B) solid is greater C) liquid is greater D) none of these When two waves arrive at a point on a medium, the combing of the waves is called A) resonance B) beats C) interference D) resonance Why is it harder to hear someone speak when you are far away from them? A) the intensity of the wave decreases as the sound wave moves. B) the speed of the wave decreases as the sound wave moves. C) the frequency gets smaller as the wave moves. D) the wavelength gets smaller as the wave moves. When the source of the sound and the observer of the sound get closer toge A) The observer detects a higher frequency than the source is producing. B) The observer detects the same frequency as the source is producing. C) The observer detects a lower frequency than the source is producing. A beat frequency is heard when A) When the frequency of two simultaneous sound waves is identical. B) When the source of the sound wave is moving away. C) When the frequency of two simultaneous sound waves is different. D) When the source of the sound wave is moving towards.

Explanation / Answer

1. Frequency doesn't affect wave speed, and Speed = Wavelength x Frequency. Thus option B) is right.

2. (F-32)(5/9) = C, thus the temperatures would be 0C, 12.7C and 27C ( as 0C = 273K). Thus option A) is right

3. SInce both the hole and the ball contract on cooling, option A) is right

4. A solid changes into liquid (undergoes phase change) at a constant temperature, so option A) is right

5. The combining of waves as they arrive at a point in a medium is called interference option C)

6. It is harder to hear as the intensity of sound wave decreases as the wave moves so option A)

7. Due to Doppler effect, the observer detected higher frequencies as both get closer so option A)

8. A beat frequency is heard when frequency of two simultaneous sound waves is different so option C)

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