Review Unit 6 Sound and Waves

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A transmitter produces radio waves of wavelength 1500 m. It takes the waves 0.025s to travel from the transmitter to a radio receiver. What is the distance between the radio transmitter and the receiver?

• 5.0 x 10³ m

• 2.0 x 10⁵ m

• 7.5 x 10⁶ m

• 1.1 x 10¹⁰ m

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A tank contains water. Ripples are produced on the surface of the water.

What causes the ripples to refract?

• The cold water in the tank is replaced by warm water.

• The ripples change speed as they move from deep to shallow water.

• The ripples hit the wall of the tank.

• The ripples pass though a narrow gap.

Light travels at a speed of 2.0 x 10⁸ m/s in a glass block.

In the glass, the wavelength of the light is 4.0 x 10^-7 m.

What is the frequency of the light?

• 2.0 x 10^-15 Hz

• 1.3 x 10^-2 Hz

• 80 Hz

• 5.0 x 10¹⁴ Hz

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A radio transmitter broadcasts at a frequency of 200kHz. What is the wavelength of these radio waves?

• 6.7 x 10^{-4 m}

• 1.5 m

• 1.5 x 10^{3 m}

• 1.5 x 10⁶ m