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liberstina [14]
3 years ago
8

Shari is trying to determine how music affects a person’s pulse rate. She has her mother listen to classic rock at a high volume

for 30 minutes, her younger brother listen to classical music quietly while he sleeps at night, and her grandmother listen to two hours of rap at a medium volume. She records each person’s pulse before and after listening to the music. What is missing from Shari’s scientific investigation?
Chemistry
2 answers:
olchik [2.2K]3 years ago
6 0

a specific hypothesis to test with a controlled experiment

Marta_Voda [28]3 years ago
5 0

Answer:

Shari's scientific investigation is missing controlled variables.

Explanation:

A good scientific investigation should change only the factor, which is examined. In the given case, Shari has no control for volume, the volume of the music may influence the rate at which the heart rate of the listener will elevate. She needs to determine the pulse of the individuals after the same time of listening.  

She has no control for age, as a grandmother would have reacted to loud music distinctly in comparison to a teenager. All her subjects should be of the similar age group, and she even has no control for wakefulness, as an individual would react to music distinctly when he or she is awake in comparison to when he is asleep.  

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loris [4]

Ok heres what i know, one of the reasons why visible light will pass through glass but not through other materials is because the molecules in glass require more energy than average to push electrons from one level to another. Photons in visible light simply do not have enough energy. Only photons of light with shorter wavelengths, such as those that make up ultraviolet light, have the ability to change the electrons in glass. This is why ultraviolet light is unable to pass through glass. Lol im in 6th grade this is all i know ! :)

8 0
3 years ago
Which of the following is not a part of every scientific investigation?
Dmitry_Shevchenko [17]

Answer:

the correct answer is Group of answer choices

6 0
3 years ago
TRIPLE POINTS!!! I NEED HELP!!! PLEASE EXPLAIN TOO!!! What is the energy of a quantum of light with a frequency of 4.31 x 1014 1
Lelechka [254]

Answer:

The answer is

2.86 \times  {10}^{ - 19}  \: J

Explanation:

The energy of a quantum of light can be found by using the formula

<h3>E = hf</h3>

where

E is the energy

f is the frequency

h is the Planck's constant which is

6.626 × 10-³⁴ Js

From the question

f = 4.31 × 10¹⁴ Hz

We have

E = 4.31 × 10¹⁴ × 6.626 × 10-³⁴

We have the final answer as

2.86 \times  {10}^{ - 19}  \: J

Hope this helps you

3 0
3 years ago
What is the percent composition of carbon in heptane c7h16
Gnom [1K]

Answer: the percent composition of carbon in heptane is 83.9%

Explanation:

<u>1) Atomic masses of the atoms:</u>

  • C: 12.01 g/mol
  • H: 1.008 g/mol

<u>2) Molar mass of heptane:</u>

  • C₇H₁₆: 7 × 12.01 g/mol + 16×1.008 g/mol = 100.2 g/mol

<u>3) Mass of carbon in one mole of heptane:</u>

  • C₇: 7 × 12.01 g/mol = 84.07 g/mol

<u>3) Percent composition of carbon:</u>

  • % = (mass in grams of C) / (mass in grams of C₇H₁₆) × 100 =

           = (84.07 g/ 100.2 g) × 100 = 83.9% ← answer

8 0
3 years ago
A small cube of iron and a large flat sheet of iron contain the same volume. Which one will completely rust first? Explain why.
Hunter-Best [27]

The flat sheet will completely rust before the iron cube. Since they both have the same volume, the flat sheet has more surface area than the small cube. This means more particles are exposed on the flat sheet that can react in a chemical reaction.

4 0
3 years ago
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