Ten questions. The result tells you which lessons you may skip.
How does the heat of the Sun reach the Earth?
A surface reflects 20 % and transmits 10 % of the radiation falling on it. Its absorptance is
Two identical cans of hot water, one dull black and one polished, stand in a cool room. Which cools faster?
The absolute temperature of a black body is doubled. The power it radiates becomes
A body of emissivity \(e\) and area \(A\) at temperature \(T\) stands in surroundings at \(T_0\). Its net rate of loss by radiation is
The Sun's spectrum peaks at \(500\,\text{nm}\). With \(b = 2.9 \times 10^{-3}\,\text{m K}\), its surface temperature is about
A black planet absorbs sunlight on a disc and radiates from its whole surface. If its radius were doubled at the same distance from the Sun, its steady temperature would
On a sunny afternoon at the seashore, the breeze near the ground blows
A radiator of area \(2\,\text{m}^2\) is \(20\,\text{K}\) hotter than the room air, with \(h = 10\,\text{W/(m}^2\,\text{K)}\). It gives the room, by convection,
The excess temperature of a body over a room at \(20\,°\text{C}\) halves every \(10\) minutes. It starts at \(100\,°\text{C}\). After \(30\) minutes it is at