26334.Which one of the following constants is related to radiation?
Gravitational constant
Planck’s constant
Critical constant
Boltzmann’s constant
26335.The temperature of a piece of metal is raised from 27°C to 51.2°C. the rate at which metal radiates energy increases nearly
1.36 times
2.36 times
3.36 times
4.36 times
26336.If a black body is heated from 27°C to 927°C. then the ratio of radiation emitted will be
1: 4
1: 16
1: 8
1: 256
26337.You are given a sphere, a cube and a thin circular plate, all made from copper and all having the same mass. If they are heated to a temperature of 200°C, then which are of them will cool fasted?
Sphere
Thin circular plate
Cube
All at the same rate
26338.A body cools from 100°C to 70°C in 8 minutes. If the room temperature is 15°C and assuming Newton’s law of cooling holds good, then time required for the body to cool from 70°C to 40°C is
14 s
10 s
8 s
5 s