Home
Class 12
PHYSICS
Four spheres A, B, C and D of different ...

Four spheres A, B, C and D of different metals but all same radius are kept at same temperature. The ratio all their densities and specific heats are `2:3:5:1` and `3:6:2:4`. Which sphere will show the fastest rate all cooling (initially) (assume black body radiation for all of them)

A

A

B

B

C

C

D

D

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Similar Questions

Explore conceptually related problems

Two spheres of same material and radius r and 2r are heated to same temperature and are kept in identical surroundings, ratio of their rate of loss of heat is

Assertion : A solid sphere and a hollow sphere of same material and same radius are kept at same temperature in atmosphere. Rate of cooling of hollow sphere will be more. Reason : If all other conditions are same, then rate of cooling is inversely proportional to the mass of body.

Two spheres A and B have diameters in the ratio 1:2 , densities in the ratio 2:1 and specific heat in the ratio 1:3 . Find the ratio of their thermal capacities.

The ratio of specific heats of two spheres is 2:3, radii 1:2, emissivity 3:1 and density 1:1. Initially, they are kept at same temperatures in atmosphere. Which sphere will cool at a faster rate initially.

A sphere, a cube and a thin circular plate, all of same material and same mass are initially heated to same high temperature. a) Plate will cool fastest and cube the slowest. b) Sphere will cool fastest and cube the slowest. c) Plate will cool fastest and sphere the slowest. d) Cube will cool fastest and plate the slowest.

A solid aluminium sphere and a solid copper sphere of twice the radius are heated to the same temperature and are allowed to cool under identical surrounding temperatures. Assume that the emisssivity of both the spheres is the same. Find ratio of (a) the rate of heat loss from the aluminium sphere to the rate of heat loss from the copper sphere and (b) the rate of fall of temperature of the aluminium sphere to the rate of fall of temperature of copper sphere. The specific heat capacity of aluminium =900Jkg^(-1)C^(-1) . and that of copper =390Jkg^(-1)C^(-1) . The density of copper =3.4 times the density of aluminium.

A sphere, a cube and a thin circular plate, all made of the same material and having the same mass are initially heated to a temperature of 3000^(@) C. Which of these will cool fastest ?

There are two thin spheres A and B of the same material and same thickness. They behave like black bodies, Radius of A is double that of B and Both have same temperature T. When A and B are kept in a room of temperature T_0 (lt T) , the ratio of their rates of cooling is (assume negligible heat exchange between A and B).

There are two thin spheres A and B of the same material and same thickness. They behave like black bodies, Radius of A is double that of B and Both have same temperature T. When A and B are kept in a room of temperature T_0 (lt T) , the ratio of their rates of cooling is (assume negligible heat exchange between A and B).

Rate of mutation is affected by: 1. temperature 2. X-rays 3. gamma rays 4. all of these