PhysicsSurya · Class 2-3
Roshni ka switch
TV ka remote dabaate ho toh TV chal jaata hai. Remote aur TV ke beech koi taar toh nahi, phir sandesh kaise gaya?
Socho pehle… phir dekho jawab
Remote ek aisi roshni bhejta hai jo hamari aankh ko nahi dikhti! TV us roshni ko pakad leta hai aur samajh jaata hai.
Roshni sirf dekhne ke kaam nahi aati. Woh sandesh bhi le jaa sakti hai. Remote ke aage ek chhota bulb hai jo ankhon se na dikhne wali roshni chamkata hai.
Kyun kaam karta hai? Kyunki TV ke andar ek 'roshni pakadne wala' hissa hai. Roshni aayi, TV ne switch daba diya! Isliye remote ko TV ki taraf karke dabaana padta hai. Beech mein haath aa jaaye toh roshni ruk jaati hai.
Scientists ne ek chhote se paani ke jeev mein bhi aisa hi switch dhoondha jo neeli roshni se khulta hai. Is khoj par is saal duniya ka bahut bada inaam, Nobel, mila.
Ghar pe try karo
Bade ke phone ka selfie (aage wala) camera chalu karo. Remote ko camera ki taraf rakh kar button dabao. Phone ki screen par remote ke aage chhoti roshni timtimaati dikhi? Aankh ko nahi dikhi, camera ko dikh gayi!
Wow!
Kuch roshni aisi bhi hai jo hum nahi dekh paate, par phone ka camera dekh leta hai!
Mummy-Papa ke liye
Aaj phone ke camera se remote ki chhupi roshni bachche ko dikhaiye aur poochhiye: 'Aankh se kyun nahi dikhi?'
3 sawaal
- Remote TV ko sandesh kaise bhejta hai?
Jawab dekho
Roshni se. Remote na dikhne wali roshni bhejta hai.
- Remote ki roshni kise dikhti hai?
Jawab dekho
Phone ke camera ko. Yeh roshni aankh ko nahi, phone ke camera ko dikh jaati hai.
- Scientists ka switch kis rang ki roshni se khulta hai?
Jawab dekho
Neeli. Woh switch neeli roshni se khulta hai.
NCERT se jodo: NCERT Class 3 EVS — hamare aas-paas ki cheezein aur roshni