30 DOL

What is the formula to calculate the speed of a mechanical wave?

If a wave has a frequency of 10 Hz and a wavelength of 2 meters, what is its speed?

• 5 m/s

• 10 m/s

• 20 m/s

• 30 m/s

Which of the following best describes the relationship between frequency and wavelength in a wave?

• They are directly proportional.

• They are inversely proportional.

• They are unrelated.

• They are equal.

A sound wave travels at 340 m/s. If its frequency is 170 Hz, what is its wavelength?

• 0.5 m

• 1 m

• 2 m

• 3 m

What is the primary factor that affects the speed of sound in air?

• Frequency

• Wavelength

• Temperature

• Amplitude

How long does it take for an echo to return if a sound wave travels to a wall 170 meters away and back at a speed of 340 m/s?

• 0.5 seconds

• 1 second

• 2 seconds

• 3 seconds

Which of the following is an example of a mechanical wave?

• Light wave

• Radio wave

• Sound wave

• Microwave

What happens to the frequency of a sound as the source moves towards an observer?

• It decreases.

• It increases.

• It remains the same.

• It doubles.

Calculate the frequency of a wave with a speed of 300 m/s and a wavelength of 3 meters.

• 50 Hz

• 100 Hz

• 150 Hz

• 200 Hz

Which of the following statements is true about the Doppler Effect?

• It only occurs with sound waves.

• It causes a change in wave speed.

• It causes a change in wave frequency.

• It only occurs when the source is stationary.