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zvonat [6]
3 years ago
10

Plz Answer all three questions thx ;)

Chemistry
1 answer:
rosijanka [135]3 years ago
6 0
How do scientist communicate their results and conclusions?
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How much energy will a photon with a frequency of 6.8 x 104 Hz emit?
Advocard [28]

Answer:

Energy emitted by photon = 45.06 × 10−32 J

Explanation:

Energy of photon is given by  E = hf

where

h is the Planck's constant whose value is 6.626×10−34J⋅s

f is the frequency of photon

________________________________________

given that

f = 6.8 x 104 Hz

1 HZ = 1 s^-1

E =  6.626×10−34J⋅s * 6.8 x 10^4 Hz

E = 45.06 × 10−32 J

Thus,

Energy emitted by photon is 45.06 × 10−32 J

8 0
4 years ago
Marian claims that Food A has slightly more than three times the Calories as Food B. Johan claims that Food B has more Calories.
Liula [17]

Explanation:

In order to justify Marian's statement we have to look at the '' Amount per serving calories'' ⇒

In food label A we can see that this value is 160 calories

In food label B we can see that this value is 50 calories

⇒ 160 calories is slightly more than three times 50 calories

Otherwise If we want to justify Johan statement we need to look at the '' serving size '' ⇒

In food label A we can see that the serving size is 1 cup (237 mL)

In food label B we can see that the serving size is \frac{1}{4} cup (56g)

Working with the information of the food label A we can write the following expression :

\frac{1Cup}{160calories}=\frac{\frac{1}{4}Cup}{x}  ⇒ Looking at the value of ''x'' ⇒

x=160calories(\frac{1}{4})=40calories

x=40calories

If we look at the same amount of portion volume :

In \frac{1}{4} cup of food A we have 40 calories

In \frac{1}{4} cup of food B we have 50 calories

We could conclude that Food B has more calories.

That's how both claims could both be justified.

8 0
4 years ago
How to calculate calories
Airida [17]

Answer:If you are sedentary (little or no exercise) : Calorie-Calculation = BMR x 1.2.

If you are lightly active (light exercise/sports 1-3 days/week) : Calorie-Calculation = BMR x 1.375.

Explanation:

8 0
3 years ago
How does bias in the data affect experimental results?
PilotLPTM [1.2K]
D.  Biased data is likely skewed for or against some variable tested, meaning it isn't an honest study.
5 0
4 years ago
Read 2 more answers
A student determines the density of an element to be 2.73 g/cm 3 . If the accepted value is 2.70 grams per cm 3 , what is the st
Brums [2.3K]

Answer:

Explanation:

percentage error = error  x 100 / correct value

= (2.73 - 2.70) x100 / 2.70

= 1.11 %

The element is Aluminium whose density is 2.702 grams / cc

Boiling point of Aluminium = 2519⁰C .

8 0
3 years ago
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