An fm radio transmitter broadcasts at 98.4 mhz with a power of
45 kw. how many photons does it generate per second?

6.9 × 10²⁹ photons

Explanation:

Given:

Frequency, υ = 98.4 MHz  = 98.4 × 10⁶ Hz

Power, P = 45 kW = 45000 J/sec

Now,

The total energy in time, t = 1 second

E = P × t  = 45000 J/sec × 1 s

or

Energy = 45000 J

also,

Energy of photons = hυ

Where, h is the Plank's constant

or

Energy of photons = 6.625 × 10⁻³⁴ × 98.4 × 10⁶

or

Energy of photons  = 6.519 × 10⁻²⁶ J

Now,

number of photons =

or

n =

or

n = 6.9 × 10²⁹ photons

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .