Which wave property has the same value for all X-rays travelling in air? A amplitude
B frequency
C speed
D wavelength
Which statement is correct?
A Gamma rays have a longer wavelength than ultra-violet waves.
B Infra-red waves have a lower frequency than radio waves
.C Microwaves have a longer wavelength than visible light.
D X-rays have a higher speed in air than visible light.

A star explodes in outer space. Which waves from the exploding star do not reach theEarth?
A infra-red
B light
C radio
D sound

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.

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.

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)