If you drop a piece of ice on a hard surface, the energy of impact will melt some of the ice. the higher it drops, the more ice will melt upon impact.

find the height from which the a block of ice should ideally be dropped to completely melt if that falls without air drag. [hint: equate the joules of gravitational potential energy to the product of the mass of ice and its heat of fusion (in si units, 335,000 j/kg. do you see why the answer doesn't depend on mass? ] express your answer to two significant figures and include the appropriate units.

b: does the answer depend on mass?

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

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.

I’ve been stuck on this for a while