THE DOPPLER EFFECT
1. TRUE or FALSE:
Ken Fused is standing on a corner when a police car passes by with its siren on. Ken hears a
different pitch when the police car is approaching him than when it is past him. This is
because the siren on the front of the car is set to a higher pitch than the siren on the back of
the car.
2. Describe the real reason Ken Fused observes what he does.
3. TRUE or FALSE:
The Doppler shift is a phenomenon that is observed only of sound waves.
Explain your
4. TRUE or FALSE:
As the source of a sound approaches an observer, the loudness of the sound increases. This
is an example of the Doppler Shift.
Explain your

Which is not a characteristic of a heat pump? a. it is used in air conditioners. b. it uses a refrigerant. c. it requires no work. d. it reverses the normal flow of thermal energy.

Infrared rays have a shorter wavelength than question 11 options: x-rays. ultraviolet rays. radio waves. gamma rays.

Antireflective coatings on solar cells are often made by applying a thin film of silicon nitride (sinx), which has an index of refractive of 1.2, on the top of the silicon solar cell, which has a refractive index of about 3.5. however, the sun emits radiation of various wavelengths which the solar cell absorbs, and the antireflective coating can only absolutely minimize the reflection of one of these wavelengths. the coating thickness is chosen to reduce the reflection of green/yellow light (e = 2.2 ev), which is the most intense color in the solar spectrum (shown below). which of the following coatings would minimize reflection of green/yellow light? the answer is 820 nm how? what is the angular width of the central maximum of an electron traveling at 2 x 108 m/s going through a single slit of width 1 mm.