Heat

In a glass prism, light of different wavelengths travels at different velocities. Since violet light has the shortest wavelength, it travels slowest in the prism, followed by red and then green light. Therefore, the velocity of violet light is less than the velocity of red light , which is less than the velocity of green light . Hence, the correct relation is .

The heat required for a change in temperature is given by the formula: Where: - is the mass of the substance - is the specific heat capacity - is the change in temperature For copper: For lead: Since the heat required for copper is equal to the heat required for lead: Solving for : Thus, the specific heat of lead is approximately .