電磁波譜：用途與危害：练习题

Which part of the electromagnetic spectrum is used for both satellite transmissions and cooking food?

When light travels from air into a rectangular glass block at an angle to the normal, which of the following describes its change in speed and direction?

A ray of light is incident on the boundary between glass and air. The critical angle for glass is \(42^{\circ}\). If the angle of incidence is increased from \(40^{\circ}\) to \(45^{\circ}\), what happens to the ray?

The power of a lens is given as \(+5.0\text{ D}\). Calculate the focal length of this lens and identify its type.

The Earth’s temperature depends on the balance between the rate of energy received from the Sun and the rate of energy radiated back into space. If the Earth's atmosphere becomes more effective at absorbing infrared radiation emitted from the surface without changing the rate of incoming solar radiation, what happens to the Earth's temperature and the power it radiates?

An object is placed in front of a converging lens. The lens has a power of \(+5.0\) dioptres.

Visible light and X-rays are both parts of the electromagnetic spectrum. A specific source emits visible light with a wavelength of \(5.0 \times 10^{-7}\) m.