Thermal Expansion
Trending Questions
At some temperature T, a bronze pin is a little large to fit into a hole drilled in a steel block. The change in temperature required for an exact fit is minimum when
Only the block is heated
Both block and pin are heated together
Both block and pin are cooled together
Only the pin is cooled
The lengths of steel and copper rods are so that the length of the steel rod is 5 cm longer than that of the copper rod at all temperatures, then length of each rod, are (α for copper = 1.7 × 10−5/∘C and α for steel = 1.1 × 10−5/∘C) -
9.08 cm; 14.08 cm
9.50 cm; 14.50 cm
9.17 cm; 14.17 cm
9.02 cm; 14.20 cm
A bar of iron is 10 cm at 20°C. At 19°C it will be (a of iron = 11 x 10-6/°C)
11 ´ 10-5 cm longer
11 ´ 10-6 cm longer
11 ´ 10-6 cm shorter
11 ´ 10-5 cm shorter
zero
αI∆t
3αI∆t
2αI∆t
- 10.52 sec.
- 20.52 sec.
- 220.52 sec.
- 202 sec.
Infrared radiation is detected by
Pyrometer
Nanometer
Photometer
Spectrometer
(IIT JEE 2003)
- αs/αa
- αa/αs
- αs/(αa+αs)
- αa/(αa+αs)