The frequency of a given region of the electromagnetic spectrum is more than 3 x 1019 hz. note that the speed of light is 2.998 x 108 m/s. which waves are found in this region? a. gamma rays b. visible light c. microwaves d. radio waves e. x–rays

-

A gamma rays

Explanation

Wavelength = speed of light / frequency

= (2.998 x 10^8 m/s)/ (3 x 10^19 Hz)

= 0.9993*10^-11 m

which is less than the threshold for X rays 10^-11 m.

Hence waves are gamma.

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.

pie chart because it is in percents ( % )