Sudhanshu Misra posted:
“An object is placed at a distance of 10cm from convex mirror of focal length15cm; find the position and nature of image?”
f= 15 cm
substitute the values
- List the three phenomenon responsible for the formation of rainbow. (Ans: Refraction, Dispersion, (Total)Internal reflection)
- Why do stars twinkle, but
Akshay Verma asks:
“i want to know, why we can’t see the stars, towards the horizon?
but we can see stars towards the zenith?
please answer me, i am gonna ask this to my teacher as well.”
“What is the thermal conductivity of a perfect conductor?”
Please check the link below for a detailed list of thermal conductivities of different materials.
Please click the link below to download the Question paper for Class XII (Aissce) Preboard Examination conducted by Kendriya Vidyalaya Sangathan, Chennai Region.
- “A source of sound frequency 256Hz is moving rapidly towards a wall with a velocity of 5m/s. How many beats per second will be heard if sound travels at a speed of 330m/s?”