Sound & Ultrasound: GCSE revision

[@muhammadazeem3148]

Thanks for the video, really helped me. However, I have a question. During SONAR, won't the ultrasound give you the wrong depth every time because there are other objects in the ocean that it would reflect off of (fish, reefs, etc)

[@mahmoudm451]

What produces ultrasound?

[@adkharu]

thanks for the lecture. will you be doing one on Infrasound?

[@DrPhysicsA]

Thanks. I have put up a video today which briefly touches on infra Sound at the end.

[@fdsChan]

hey everyone +drphysicsa how do you know the amplitude of the sound wave

[@0308.]

Thinking the same 🤧😢,Physics IGCSE exam in just 8 days

[@acho8387]

Thank you for the amazing lecture! I was wondering. Is there any chance that you'll make any calculus lecutres in the future? Have a good day.

[@DrPhysicsA]

Thanks. I usually assume that my viewers already understand the basics of calculus.

[@SaintWilliamIII]

DrPhysicsA Is calculus included on the GCSE exams? I live in the US and usually calculus isn't until senior year of high school. You do such an excellent job of teaching that I think many students would benefit from calculus lectures. I have found out the hard way that all teachers are not equal, and that having a degree does not qualify someone as a real teacher; being a real teacher is a gift and you have it.

[@parataku7472]

SaintWilliamIII I'm a GCSE student. Calculus has never appeared on any physics or maths specifications. Perhaps check higher exams called A Levels (they are exams which you take in your last two years of highschool to get into university [college], so kind of like your SATs I think?) Sorry for the one year late reply... I just thought I'd answer the question >.< I hope I was still helpful in some way

[@alanz3190]

I assume that in the case of sonar or medical ultrasound you would have to know the velocity of sound relative to that medium and could not use the 340 m/s velocity of air.

[@DrPhysicsA]

Yes.

[@pyotr_sky7431]

Can you describe what resonance is and also its equation. I want to confirm wether both the definition and the equation correctly. Is the equation ( In= (2n-1) λ over 4 ) correct

[@forced420]

1 HeHe