Question
In science sometimes we observe certain phenomenon experimentally but are unable to give a logical equation or theory for that. Sometimes, it also happens that we have a scientific theory supported by mathematical formulation yet are unable to test it immediately. Cite one such example.

Answer

Einstein worked to establish a relation between the energy and mass of body. He was of the view that these are the two sides of the same coin or two facets of the same physical quantity. He succeeded when he gave his mass energy equation $E = mc^2$. But its experimental verification came 40 years later in 1945 when atomic bomb was exploded over Japan.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Water is boiled in a container having a bottom of surface area $25cm^2$, thickness $1.0mm$ and thermal conductivity $50\text{wm}^{-1}{^{\circ}}\text{C}^{-1}.$ 100g of water is converted into steam per minute in the steady state after the boiling starts. Assuming that no heat is lost to the atmosphere, calculate the temperature of the lower surface of the bottom. Latent heat of vaporization of water $=0.26\times10^6\text{Jkg}^{-1}.$
A constant force of 2.50N accelerates a stationary particle of mass 15g through a displacement of 2.50m. Find the work done and the average power delivered.
Two identical steel wires are under tension and are in unison. When the tension in one of the wires is increased by $1$ percent, $4$ beats per second is heard. Find the original frequency of the wires.
A Carnot engine whose heat sink is at $27°C$ has an efficiency of $40\%$. By how many degrees should the temperature of source be changed to increase the efficiency by $10\%$ of the original efficiency?
A bomb at rest explodes into three parts of the same mass. The moments of the two parts is $-2 p_{\mathrm{i}}$ and $\mathrm{p}_{\mathrm{j}}$. What will be the momentum of the third part?
If the frequency of a tuning fork is 256Hz and speed of sound in air is 320m/s, find how far does the sound travel when the fork executes 64 vibrations?
A vessel containing one mole of a monatomic ideal gas (molecular weight =$20gmol^{-1}$) is moving on a floor at a speed of $50ms^{-1}$. The vessel is stopped suddenly. Assuming that the mechanical energy lost has gone into the internal energy of the gas, find the rise in its temperature.
Pressure decreases as one ascends the atmosphere. If the density of air is $\rho,$ what is the change in pressure dp over a differential height dh?
Explain the concept of absolute zero of temperature on the basis of kinetic theory of gases.
The radius of the earth is reduced by 4%. The mass of the earth remains unchanged. What will be the change in escape velocity?