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lesantik [10]
3 years ago
13

Microwave ovens work by irradiating food with microwaves, which are absorbed by the water molecules in the food and converted to

heat. Assuming that microwave ovens emit radiation with a wavelength of 29.7 cm, calculate how many photons are emitted per second in a 600-Watt microwave oven. (1 W = 1 J/s)
Chemistry
1 answer:
Dima020 [189]3 years ago
6 0

Answer:

8.969×10²⁶ photons

Explanation:

From the question,

Using,

E = hc/λ........................... Equation 1

Where E = Energy of the photon, h = Planck's constant, c = speed of light, λ = wave length of the photon.

Given: h =  6.626×10⁻³⁴ J.s, c = 3×10⁸ m/s, λ = 0.297 m

Substitute into equation 1

E = 6.626×10⁻³⁴(3×10⁸)/0.297

E = 6.69×10⁻²⁵ J.

The energy of the photon in one seconds = 6.69×10⁻²⁵ J/s

If the power of the microwave oven  = 600 J/s

Then,

Number of photons emitted per seconds = 600/(6.69×10⁻²⁵)

Number of photons emitted per seconds = 8.969×10²⁶ photons

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What are metals that have been mixed together called
d1i1m1o1n [39]

Answer:

Alloys

I hope this helps!

6 0
3 years ago
Without using Appendix B, predict the sign of ΔS° for(b) KBr(s)→ KBr(aq)
Volgvan

Since the sign is positive, the entropy increased by 88.48 J/K.

Examine the phases of the species present to determine whether a physical or chemical process will cause an increase or decrease in entropy. Keep in mind "Silly Little Goats" to aid you in telling.

[1 Sf K+1 + 1 Sf Br-1 (aq)] ([1Sf(KBr (s))])

[1(102.5) + 1(82.42)] - [1(96.44)] = 88.48 J/K

If the entropy has grown, we say that Delta S is positive, and if it has dropped, we say that Delta S is negative. Due to its ionic nature, KBr is soluble in water and causes the 'K(+)' ions to hydrate.

Learn more about Entropy here-

brainly.com/question/13146879

#SPJ4

8 0
1 year ago
I need help can you help
telo118 [61]
I can sure try to help!
8 0
3 years ago
You are given a solution that is 518 mM lactose. You need to make up 4.5 L of 16.7 mM solution. What volume do you need to trans
OLga [1]

Answer:

The volume you need to transfer from the stock solution is 0.145 l

Explanation:

Since the number of moles of lactose in the volume of stock solution that you transfer will be the same as the number of moles of lactose in the final solution, you can use this expression:

number of moles in volume to transfer = number of moles in the final solution

Since number of moles = concentration * volume (if the concentration is expressed in molarity), then:

Ci * Vi = Cf * Vf

where:

Ci = concentration of the stock solution.

Vi = volume of the stock solution to be transferred.

Cf = concentration of the final solution

Vf = volume of the final solution

Then, replacing with the data:

518 mM * Vi = 16.7 mM * 4.5 l

Vi = 16.7 mM * 4.5 l / 518 mM

<u>Vi = 0.145 l or 145 ml</u>

Notice that any concentration unit can be used, as long as the units of the concentration of the stock and final solution are the same.

4 0
3 years ago
Regarding the formula al2o3 which of the following is accurate
user100 [1]
You forgot to post 'the following' .
8 0
3 years ago
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