Question 1:

Sound waves are longitudinal waves (compression and rarefaction). Water waves on the surface of the sea are transverse waves (the water particles move up and down perpendicular to the direction of wave travel).

So row A: sound waves longitudinal, water waves transverse.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 2:

The typical range of human hearing for a healthy young person is approximately 20 Hz to 20,000 Hz.

So the correct answer is C. 20 - 20 000 Hz.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 3:

Sound requires a medium (such as air, water, or solids) to travel through, so it cannot pass through a vacuum.
Light does not require a medium and can travel through a vacuum, so it can pass through a vacuum.

The correct row is B.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 4:

Based on oscilloscope display conventions:

• Height (amplitude) → loudness (tall = loud, short = quiet)

• Number of waves in a fixed width → frequency (more waves = higher pitch, fewer waves = lower pitch)

• Wavelength is inversely related to frequency in a fixed box width (more waves = shorter wavelength, fewer waves = longer wavelength)

  Loud, high-pitched sound → D (tall height, many waves)

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 5:

Based on oscilloscope display conventions:

• Height (amplitude) → loudness (tall = loud, short = quiet)

• Number of waves in a fixed width → frequency (more waves = higher pitch, fewer waves = lower pitch)

• Wavelength is inversely related to frequency in a fixed box width (more waves = shorter wavelength, fewer waves = longer wavelength)

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 6:

The speed of sound in this experiment is determined by measuring the total distance the sound travels (to the wall and back) and the time it takes to do so.

• Distance to wall = 50 m → total distance traveled by sound = 2×50=100 2 × 50 = 100 m

• Time between original sound and echo = 0.3 s → this is the total time for the round trip

Speed = total distance / total time = 100 m/0.3 s 100 m/0.3 s

Frequency (II) is not needed to find the speed of sound in this method — it would be needed for the v=fλ v = fλ formula, but that’s not used here.

So the necessary data are I and III.

Answer: B. I and III

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 7:

The sound travels to the wall and back:

• Distance to wall = 50 m → round trip distance = 50×2=100 m 50 × 2 = 100 m

• Time = 0.3 s

Speed = distance / time

Closest answer: 333 m/s

Answer: B. 333 m/s

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 8:

The main issue is that the time interval (0.3 s) is short, making it hard to measure accurately.

• A. Move further back from the wall → increases the distance, so the echo takes longer to return → longer time interval → reduces percentage timing error → improves accuracy.

• B. Hit the blocks harder → makes sound louder but doesn’t increase the time interval.

• C/D. Change frequency → does not change the speed of sound or the distance to the wall, so the time interval remains the same.

Thus, the correct improvement is A.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 9:

The device that detects sound waves (pressure variations in air) and converts them into electrical signals is a microphone.

Answer: A. a microphone
(Note: A common mistake is to answer with 'loudspeaker'. This converts electrical signals into sound waves, not the other way round).

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 10:

If a higher pitch note is produced, the frequency increases. That means:

• Time period = 1/f → decreases.

• Wavelength = v/f → decreases (since velocity is constant in the same medium).

The velocity of sound depends on the medium (temperature, pressure, etc.), not on the pitch of the note produced by the instrument. So velocity remains unchanged.

Thus, the measurement that will not change is B. velocity.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.