विज्ञान और उसकी शिक्षा : हिंदी पीडीऍफ़ पुस्तक – विज्ञान | Vigyan Aur Uski Shiksha : Hindi PDF Book – Science (Vigyan)
Pustak Ka Vivaran : Ek Din main kaksha mein zor se bolate huye soch raha tha ki Nishchit roop se ham dhvani ko sun to sakate hain, par kya koi aisa tareeka hai ki ham use dekh saken? Kisi ko dhuan paida karane ka khayal -aaya to hamane kuchh kagaz jalaye aur usase nikalane vale dhuen mein kampan karati huyi tyooning fork ko rakha. Lekin tyooning fork ke kampan………
Description about eBook : One day I was talking out loud in class thinking that of course we can hear the sound, but is there any way that we can see it? Thinking of someone creating smoke – we burnt some paper and kept the tuning fork vibrating in the smoke emanating from it. But the vibrations of the tuning fork ………
