हिंदी

The dimensions of emissive power are ______.

Advertisements
Advertisements

प्रश्न

The dimensions of emissive power are ______.

विकल्प

  • [M1 L-2 T-3]

  • [M1 L2 T-3]

  • [M1 L0 T-3]

  • [M1 L0 T-2]

MCQ
रिक्त स्थान भरें
Advertisements

उत्तर

The dimensions of emissive power are [M1 L-2 T-3].

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
2014-2015 (October)

APPEARS IN

संबंधित प्रश्न

Define emissive power and coefficient of emmision of a body.


A metal sphere cools at the rate of 4°C / min. when its temperature is 50°C. Find its rate of cooling at 45°C if the temperature of surroundings is 25°C.


A pinhole is made in a hollow sphere of radius 5 cm whose inner wall is at temperature 727oC. Find the power radiated per unit area. [Stefan’s constant σ = 5.7 x 10-8 J/m2 s K4 , emissivity (e) = 0.2]


A body cools from 62°C to 54°C in 10 minutes and to 48°C in the next 10 minutes. Find the temperature of the surroundings.


The kinetic energy per molecule of a gs at temperature T is ________.

(a) `(3/2)RT`

(b) `(3/2)K_BT`

(c) `(2/3) RT`

(d) `(3/2)("RT"/M)`


A body cools from 80° C to 70° C in 5 minutes and to 62° C in the next 5 minutes. Calculate the temperature of the surroundings.


Why do marine animals live deep inside a lake when the surface of the lake freezes?


The density of water at 4°C is supposed to be 1000 kg m–3. Is it same at sea level and at high altitude?


If the temperature of a uniform rod is slightly increased by ∆t, its moment of inertia I about a line parallel to itself will increase by


An aluminium sphere is dipped into water at 10°C. If the temperature is increased, the force of buoyancy


A spinning wheel is brought in contact with an identical wheel spinning at identical speed. The wheels slow down under the action of friction. Which of the following energies of the first wheel decreases?

(a) Kinetic
(b) Total
(c) Mechanical
(d) Internal


As the temperature is increased, the time period of a pendulum


When a solid melts or a liquid boils, the temperature does not increase even when heat is supplied. Where does the energy go?


A person's skin is more severely burnt when put in contact with 1 g of steam at 100°C than when put in contact with 1 g of water at 100°C. Explain


The mechanical equivalent of heat ____________ .


The heat capacity of a body depends on

(a) the heat given

(b) the temperature raised

(c) the mass of the body

(d) the material of the body


If heat is supplied to a solid, its temperature

(a) must increase

(b) may increase

(c) may remain constant

(d) may decrease


A resistance thermometer reads R = 20.0 Ω, 27.5 Ω, and 50.0 Ω at the ice point (0°C), the steam point (100°C) and the zinc point (420°C), respectively. Assuming that the resistance varies with temperature as Rθ = R0 (1 + αθ + βθ2), find the values of R0, α and β. Here θ represents the temperature on the Celsius scale.


A concrete slab has a length of 10 m on a winter night when the temperature is 0°C. Find the length of the slab on a summer day when the temperature is 35­°C. The coefficient of linear expansion of concrete is 1.0 × 10–5 °C–1.


A steel wire of cross-sectional area 0.5 mm2 is held between two fixed supports. If the wire is just taut at 20°C, determine the tension when the temperature falls to 0°C. Coefficient of linear expansion of steel is 1.2 × 10–5 °C–1 and its Young's modulus is 2.0 × 10–11 Nm–2.


Answer the following question.

Clearly, state the difference between heat and temperature?


Define one mole.


Our normal body temperature is ______.


When two bodies at different temperatures are placed in contact, heat flows from ______.


What is the dimensional formula of heat?


Which state of matter has particles that vibrate about fixed equilibrium positions?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×