Question
Write the formula for specific heat. Hence, obtain its unit.
✓
Answer
Specific heat of a substance,
c =Qm(Tf−Ti) , where m is the mass of the substance and Q is the amount of heat supplied to the substance to increase its temperature from Ti to Tf.
The SI unit of heat is the joule (J), that of mass is kg and that of temperature is kelvin (K).
∴ The SI unit of specific heat =J(kg⋅K)
[Note: Specific heat is also expressed in J/(kg°C) and cal/(g°C).]
c =
The SI unit of heat is the joule (J), that of mass is kg and that of temperature is kelvin (K).
∴ The SI unit of specific heat =
[Note: Specific heat is also expressed in J/(kg°C) and cal/(g°C).]
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Sitar, Santoor and Mandoline or mandoline (String instruments):
Material:
Torch light, mirror, a stand for hanging the mirror, black paper, comb, white paper, drawing board.
Activity :
1. Fit a white paper tightly over a table or drawing board.
2. Leaving out some portion in the middle of the comb, cover the rest with black paper so that light can only pass through the open central portion.
3. Hold the comb perpendicular to the white paper and throw torch light on its central portion.
4. Adjust the comb and torch so as to get light rays on the white paper. Now keep a mirror in the path of this ray of light as shown in the figure.
5. What do you observe?
Torch light, mirror, a stand for hanging the mirror, black paper, comb, white paper, drawing board.
Activity :
1. Fit a white paper tightly over a table or drawing board.
2. Leaving out some portion in the middle of the comb, cover the rest with black paper so that light can only pass through the open central portion.
3. Hold the comb perpendicular to the white paper and throw torch light on its central portion.
4. Adjust the comb and torch so as to get light rays on the white paper. Now keep a mirror in the path of this ray of light as shown in the figure.
5. What do you observe?
