Advertisements
Advertisements
प्रश्न
A solid metal weighing 150 g melts at its melting point of 800 °C by providing heat at the rate of 100 W. The time taken for it to completely melt at the same temperature is 4 min. What is the specific latent heat of fusion of the metal?
Advertisements
उत्तर
Given:
m = 150g = 150 × 10(-3) kg = 0.15 kg
Power (P) = 100W,
Time (t) = 4 min = 4 × 60 sec
The amount of heat supplied in 4 min
Heat energy (Q) = 100 × 4 × 60 = 24000 J
This heat energy is used in melting.
Let L be the latent specific heat.
∴ L = `"Q"/"m"`
∴ L = `24000/0.15`
= 1.6 × 105 J kg-1
APPEARS IN
संबंधित प्रश्न
How much heat energy is released when 5.0 g of water at 20℃ changes into ice at 0℃? Take specific heat capacity of water = 4.2 J g-1 K-1, Specific latent heat of fusion of ice = 336 J g-1.
Explain the meaning of green house effect.
Water boils at 120 °C in a pressure cooker. Explain the reason.
If 'Cp' and 'Cv' are molar specific heats of an ideal gas at constant pressure and volume respectively. If 'λ' is the ratio of two specific heats and 'R' is universal gas constant then 'Cp' is equal to ______.
The molar specific heats of an ideal gas at constant pressure and constant volume are denoted by Cp and Cv respectively. If `gamma = "C"_"p"/"C"_"v"` and R is the universal gas constant, then Cp is equal to ______.
Heat is applied to a rigid diatomic gas at constant pressure. The ratio ΔQ : ΔU : ΔW is ______.
Two metals A and B have specific heat capacities in the ratio 2:3. If they are supplied same amount of heat then
If the mass ratio of metal A and metal B is 3:5 then calculate the ratio in which their temperatures rise.
Calculate the amount of heat energy required to raise the temperature of 200 g of copper from 20°C to 70°C. Specific heat capacity of copper = 390 J kg-1 K-1.
