Question (1 point) 1st attempt the spectrum of a blackbody has a peak wavelength of 6.90x10 7 meters. what is its temperature, in kelvins?

4202.8985 K

Explanation:

Using Wien's displacement law which states that the temperature and the wavelength of the blackbody radiation are inversely proportional.

So,

λmax= b/T

Where,

λmax is the peak of wavelength

b is the Wien's displacement constant having value as

T is the Absolute Temperature in Kelvin.s

So,

T = b/λmax = = 4202.8985 K

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.