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Physics Chapter: Waves and Energy Sources

15 Questions

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Physics Chapter: Waves and Energy Sources

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Questions and Answers

What defines wavelength in a wave?

The distance between two consecutive peaks or troughs (correct)

The direction in which the wave propagates

The highest point on a wave

The number of waves that pass a point per second

If a wave has a frequency of 40 Hz, how many cycles occur in one second?

30 cycles

50 cycles

20 cycles

40 cycles (correct)

Which formula correctly calculates the velocity of a wave?

Velocity = wavelength / frequency

Velocity = frequency + wavelength

Velocity = displacement × time

Velocity = frequency × wavelength (correct)

What is the significance of the frequency range between 20 Hz to 40 Hz?

It is associated with ultrasound waves Signup and view all the answers

What happens to sound waves when they are converted through a solid?

They are modified into vibrations Signup and view all the answers

What is a common advantage of both wind turbines and hydroelectricity?

They are both renewable sources of energy. Signup and view all the answers

Which disadvantage is specifically associated with wind turbines?

They can harm birds and other wildlife. Signup and view all the answers

How do hydropower systems compare to wind systems in terms of reliability?

Hydroelectricity is more reliable than wind turbines. Signup and view all the answers

What is a significant disadvantage of hydroelectricity mentioned?

It is costly and may be noisy. Signup and view all the answers

What is a financial aspect shared by both wind and hydroelectric energy sources?

They have no fuel cost. Signup and view all the answers

What primarily occurs when sound waves enter a solid?

They are converted to vibrations that travel through the solid. Signup and view all the answers

Which frequency range defines normal human hearing?

20 Hz to 20,000 Hz Signup and view all the answers

What is the primary purpose of ultrasound waves in medical settings?

To obtain images of organs and tissues. Signup and view all the answers

What does the Law of Reflection state?

The angle of incidence is equal to the angle of reflection. Signup and view all the answers

What happens to a wave during refraction?

It changes direction because its speed changes. Signup and view all the answers