Physics-

General

Easy

Question

# If two metallic plates of equal thicknesses and thermal conductivities and are put together face to face and a common plate is constructed, then the equivalent thermal conductivity of this plate will be

## The correct answer is:

### In series,

### Related Questions to study

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### The graph, shown in the adjacent diagram, represents the variation of temperature of two bodies, and having same surface area, with time () due to the emission of radiation. Find the correct relation between the emissivity and absorptivity power of the two bodies.

Rate of cooling emissivity(e)

From the graph,

Further emissivity () absorptive power () (good absorbers are good emitters also)

From the graph,

Further emissivity () absorptive power () (good absorbers are good emitters also)

### The graph, shown in the adjacent diagram, represents the variation of temperature of two bodies, and having same surface area, with time () due to the emission of radiation. Find the correct relation between the emissivity and absorptivity power of the two bodies.

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Rate of cooling emissivity(e)

From the graph,

Further emissivity () absorptive power () (good absorbers are good emitters also)

From the graph,

Further emissivity () absorptive power () (good absorbers are good emitters also)

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Apply SinC+SinD formula

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Apply SinC+SinD formula

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### Value of is

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### Which of the following is set A?

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### In a population of 100 persons, 40 persons like tea and 30 persons like coffee. 10 persons like both of them. How many persons like neither tea nor coffee?

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### In a population of 100 persons, 40 persons like tea and 30 persons like coffee. 10 persons like both of them. How many persons like only coffee?

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