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In the syllabus it does say, describe the use of a diode and its use in rectification.
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Physics, Chemistry and Biology: Post your doubts here!
- Thread starter semsemhosam
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In the syllabus it does say, describe the use of a diode and its use in rectification.
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There's no need to go all complicated and include stuff like the radiometer. Instead there's a much simpler experiment than what either of you want to use.
Bring two surfaces, one black and the other white, close to a heat source. Attach a Coin to wax, and the wax to both surfaces.
The better absorber will melt the wax and the coin will fall, the poor absorber will absorb less heat and the coin will still stick to the wax.
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How to draw? I can't do it!!
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The focal length is 3.0 cm. That means 3.0 cm from the centre of the lens. You draw this on both sides of XY, to the left and to the right. Then you label these points as F.
Next it says that your object is at the 2.0 cm mark to the left of the lens, mark this point, and draw an object 2.0 cm high.
Draw a line to XY from the top of your 2.0 cm line, and draw a line from the top of your 2.0 cm line, that intersects with the centre of line XY.
Extend both these lines and you will see an image form behind your object. This image is virtual and magnified.
Here's one tip I can give you, whenever your object is in between the lens and F. The image produced will always be virtual and magnified.
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For the transistor to work, it is necessary that the base get current.
As you can see, the base will get current only when the switch S1 is closed.
So, when S1 is open, base will not get the current and the lamps wont light.
Hope you get it.
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For this, you should remember that if a body is dropped from a certain height, it's final velocity is given by v = acceleration due to gravity * time = gt.
So, to find time taken for stone to drop, since the stone takes the same time to drop as sound from the boat takes to reach the listener.
→ Time = Dist (btw boat and man)/ Speed (of sound)
t = 800/320 = 2.5s
Substituting in v = gt → v = 10 * 2.5 = 25 m/s
Hope you get it.
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what happens to the voltage if there are 3 batteries in a circuit and one battery is reversed?
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i guess the current wont flow
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so there is no e.m.f..?
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A presence of a reversed will most likely prevent the current from flowing, and in most cases may damage the battery severely.
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oh, alright thanks
then i lost at least 1 mark today...
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oh, alright thanks
Oh u did the exam?!, how was it? (no questions discussion)
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oh, alright thanks
wait!! current may flow, but the polarity may differ, and the reversed battery will be damaged.
Now three DC batteries/Sources are connected in series,while the one is of reverse polarity of the 2 others ( that cause to establish two currents with opposite direction of each other). Under such a series connection, the resultant voltage is measured by subtracting the lower voltage from the higher one. And finally direction of current can be determined after we calculate the resulting voltage.
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how cn the current flow , as it would act like a barrier and so break the circuit bt i guess there ll be a p.d across the batteries
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Shut you, understand? I'm not doing any sort of begging out here, nor did I have any intention of obtaining the paper. Keep your surprises to yourself- i don't need telling. Over.
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P.D is the energy used to push th current, so if two current are pushing against each other, the one which has more volt will be able to push the other one (she mentiond 3 batteries, and one is reversed) so its 2:1, in small circuit i dont think there may be a large damage, so stronger current will flow but with less volts and the pole of the current may be reversed.
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hi
can anyone tell me if radiation can take place if there is no vacuum present???
can anyone tell me if radiation can take place if there is no vacuum present???
yes
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what you mean by no vacuum , air is present ????