Three waves travel to the right with the same speed. Which wave has the highest

Question

Three waves travel to the right with the same speed. Which wave has the highest frequency? Sound is a wave. It is also a wave. Spherical Transverse Non-mechanical Longitudinal Non-mechanical Transverse Mechanical Longitudinal Mechanical Transverse Amy and Zack, who are both at rest, are listening to a moving source of sound, which is emitting a frequency f The statements below relate the frequencies that they receive. Which is true ? A radio station calls itself "KOOL 105" because it broadcasts radio waves at 105 MHz. If instead the station was named after the wavelength (in m) they broadcast, what would they be called KOOL.36 KOOL 2.86 KOOL 3.6 KOOL 236 KOOL 236 A wave traveling on a string has a period of.2 s, a wavelength of 32 cm, and an amplitude of 3 cm. The speed of this wave is.6 cm/s 6.4 cm/s 15 cm/s 64 cm/s 160 cm/s

Explanation / Answer

9) frequency = 1 / T

where T = time period = time taken to complete on full wave (cycle)

T is min for B hence f is max of B.

Ans. B

10. sound is mechanical wave but also longitudinal.

Ans D.

11. Applying doppler effect:

V = (V + Vr) f0 / (V + Vs)

where V = velocity of wave (same for both)

Vr = velocity of receiver = 0 ]

Vs = velocity of source = (if going away then +ve otherwise -ve )

for amy, famy = (V f0 ) / (V + Vs)

for Zack, FZack = (V f0 ) / (V - Vs)

henece Famy < fs < Fzack

Ans(D)

12.
wavelength = speed / frequency = (3 x 10^8 ) / (105 x 10^6)

        = 2.86

ANs (B)

13.T = 0.2 s

Speed = wavelengt / time period = 32 cm / 0.2 s = 160cm/s

Ans(E)

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