1800-150-456-789
FlagBACK
Flag Thermal Physics> The Pyrex glass mirror in the telescope a...
question mark

The Pyrex glass mirror in the telescope at the Mount Palomar Observatory (the Hale telescope) has a diameter of 200 in. The most extreme temperatures ever recorded on palomar Mountain are - 10°C and 50°C, Determine the maximum change in the diameter of the mirror.

Shane Macguire , 9 Years ago
Grade upto college level
anser 1 Answers
Mohammad Fasih

Last Activity: 5 Years ago

diameter =d=200 inc
change in temperature =\DeltaT=50°-(-10°) = 60°C
cofficient of expansion for pyrax glass=\alpha=3.2×10^-6/C°
FORMULA:
                    \DeltaL=\DeltaT×\alpha×d
                          =60°C × 3.2×10^-6/C°× 200 inc
                          =38400 × 10^-6 inc
                        = 0.0384 inc
 
so, maximum increase in diameter is 0.0384 inc and total diameter after increase in temperature is = 200inc + 0.0384inc 
    = 200.0384 inc

Provide a better Answer & Earn Cool Goodies

Enter text here...
star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments


Ask a Doubt

Get your questions answered by the expert for free

Enter text here...

Other Related Questions on Thermal Physics

question mark
A container filled with a sample of an Idea gas at the pressure of 1.5atm. the gas is compressed isothermal ly to one fourth of its original volume. What is the new pressure of the gas?
Thermal Physics
0 Answer Available

Last Activity: 1 Year ago(s)

question mark
how do we know the electric field due to an electric dipole of dipole moment P at distance r from the centre of dipole is fiven by .. where theta is angle between p amd r vector..
Thermal Physics
0 Answer Available

Last Activity: 2 Year ago(s)

question mark
A A mole of helium gas initially at stp undergoes an isovolumetric process in which its pressure falls to half its initial value. The work done by gas is
Thermal Physics
0 Answer Available

Last Activity: 2 Year ago(s)

question mark
\t5000 J of heat are added to two moles of an ideal monatomic gas, initially at a temperature of 500 K, while the gas performs 7500 J of work. What is the final temperature of the gas? step by step please
Thermal Physics
1 Answer Available

Last Activity: 2 Year ago(s)

question mark
Please help me with theanswer of this questionrelated to radiation graph
Thermal Physics
0 Answer Available

Last Activity: 2 Year ago(s)