We would like to make a vessel whose volume does not change with temperature. We can use brass and iron `(beta_(brass) = 6 xx 10^-5//k` and `beta_(iron) = 3.55 xx 10^-5//k)` to create a volume of 100 cc. How do you think you can achieve this.

We would like to prepare a scale whose length does not change with temperature. It is proposed to prepare a unit scale of this type whose length remains, say 10 cm. We can use a bimetallic strip made of brass and iron each of different length whose length (both components) would change in such a way that difference between their lengths remains constant. If alpa_(iron = 1.2 xx 10^-5 //K and alpha_(brass = 1.8 xx 10^-5//K , what should we take as length of each strip?

According to Stefan's law of radiation, a black body radiates energy sigmaT^4 from its unit surface area every second where T is the surface temperature of the black body and sigma = 5.67 xx 10^-8 W//m^2 K^4 is known as Stefan's constant. A nuclear weapon may be thought of as a ball of radius 0.5 m. When detonated, it reaches temperature of 10^6 K and can be treated as a black body. Estimate the power it radiates

There are three cans one of them holds exactly 10 litres of milk and useful the other two can hold a 7 litres and 3 litres respectively then no graduation mark on the cans customer ask for 5 litres of milk how would you give him the amount he ask he would not be satisfied by estimates​.

In a p-n junction diode, the current I can be expressed as I = I_0 exp ((eV)/(2k_BT)) where I_0 is called the reverse saturation current, V is the voltage across the diode and is positive for forward bias and negative for reverse bias, and I is the current through the diode, k_B is the Boltzmann constant (8.6xx 10^-5 (eV)/K) and T is the absolute temperature. If for a given diode I_0 = 5 xx 10^-12 A and T = 300 K, then - What will be the increase in the current if the voltage across the diode is increased from 0.6 V to 0.7 V?

It is desired to make a 20.0Omega coil of wire whose temperature coefficient of resistance is zero. To do this, a carbon resistor of resistance R_(1) is placed in series with an iron resistor of resistance R_(2) . The proportion of iron and carbon are so chosen that R_(1) +R_(2)= 20 Omega for all temperatures near 20^@C . Find the values of R_(1) and R_(2). Temperature coefficient of resistance for carbon, alpha_(C)= - 0.5 xx 10^(-3)//^(@)C and that of iron is alpha_(Fe) =5 xx 10^(-3)//^(@)C.

In a p-n junction diode, the current I can be expressed as I = I_0 (exp ((eV)/(2k_BT))-1) where I_0 is called the reverse saturation current, V is the voltage across the diode and is positive for forward bias and negative for reverse bias, and I is the current through the diode, k_B is th Boltzmann constant (8.6xx 10^-5 eV/K) and T is the absolute temperature. If for a given diode I_0 = 5 xx 10^ -12 A and T = 300 K, then - What will be the current if reverse bias voltage changes from 1 V to 2 V?

In a p-n junction diode, the current I can be expressed as I = I_0 exp ((eV)/(2k_BT)) where I_0 is called the reverse saturation current, V is the voltage across the diode and is positive for forward bias and negative for reverse bias, and I is the current through the diode, k_B is th Boltzmann constant (8.6xx 10^-5 (eV)/K) and T is the absolute temperature. If for a given diode I_0 = 5 xx 10^-12 A and T = 300 K, then - What is the dynamic resistance when the voltage is increased to 0.7 V from 0.6 V?

In a p-n junction diode, the current I can be expressed as I = I_0 (exp ((eV)/(2k_BT))-1) where I_0 is called the reverse saturation current, V is the voltage across the diode and is positive for forward bias and negative for reverse bias, and I is the current through the diode, k_B is th Boltzmann constant (8.6xx 10^ -5 eV/K) and T is the absolute temperature. If for a given diode I_0 = 5 xx 10^ -12 A and T = 300 K, then - What will be the forward current at a forward voltage of 0.6 V?

One day in the morning, Ramesh filled up 1/3 bucket of hot water from geyser, to take bath. Remaining 2.3 was to be filled by cold water (at room temperature) to bring mixture to a comfortable temperature. Suddenly Ramesh had to attend to something which would take some time say 5 - 10 minutes before he could take bath. Now the he had two options: (i) fill the remaining bucket completely by cold water and then attend to the work, (ii) first attend to the work and fill the remaining bucket just before taking bath. Which option do you think would have kept water warmer ? Explain.

Starting out on a trip into the mountains, you inflate the tires on your automobile to a recommended pressure of 3.21xx10^(5) Pa on a day when the temperature is - 5.0^(@)C . You drive to the beach, where the temperature is 28.0^(@)C . Assume that the volume of the tire has increased by 3%. What is the final pressure in the tyres?