The equation for photon energy, e, is e=hcλ where h = 6.626×10−34 j⋅s (planck's constant) and c = 2.99×108 m/s (the speed of light). what is the wavelength, λ, of a photon that has an energy of e = 4.52×10−19 j ? express your answer numerically in meters.

λ = 4.383×10⁻⁷ m

Explanation:

Given data:

h = 6.626 ×10⁻³⁴ j.s

c = 2.99 ×10⁸ m/s

Wavelength = ?

Energy = 4.52×10⁻¹⁹ J

Solution:

E = h.c/λ

We will rearrange the formula:

λ = h.c/E

Now we will put the values:

λ = 6.626 ×10⁻³⁴ j.s × 2.99 ×10⁸ m/s / 4.52×10⁻¹⁹ J

λ = 19.812×10⁻²⁶ j.m  / 4.52×10⁻¹⁹ J

λ = 4.383×10⁻⁷ m

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.