Yeah i am taking the temperature from the middle. Two holes were drilled into the aluminum block, in one hole thermometer was placed, in the other my heater was placed. The whole aluminum block was lagged to reduce heat losses. (I didnt actually experiment that but my physics notes say so). And...
When a heating experiment for example when measuring the specific heat capacity of an aluminum block, why is it practical to turn the heater off and wait for the highest temperature reading on the thermometer and take that reading.
Why does the reading even rise when the heater is turned off...
Nope I don't get it :/ . Esp the last part when you said 'it is very practical if the image is not exactly on top of the object, but a bit to a side'
How is the image even produced next to it? I feel it should exactly overlap the object. :/
http://imgur.com/a/nFJ0a According to this passage the image of an object after being reflected by a plane mirror is formed right next to the initial object position. However if you see the light rays, they come back exactly the same path after striking the mirror, then why doesn't the image...
yeaah i tried using magnification=image/object ratio thing. But idk why in the solution they have taken the length of image as 50. I agree with taking 20 as the length of object but i don't get the taking 50 as the length of image.
Thankyou soo much guys. Yeah i do understand till that part that the circuit is earthed and electron deficiency can be fulfilled from electrons from Earth and hence the metal never runs out of electrons. I didnt understand the rest of the part XD.
Hey currently I am doing O levels and in my textbook I read that when a metallic wire (in CRO - the cathode) is heated up, it starts emitting its free electrons (thermionic emission). And also its a fact that electrons are responsible for electrical conductivity. A question just popped up in my...