1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
BaLLatris [955]
3 years ago
11

The sound of a police siren that is moving away has (1) _____ wavelengths, and one that is approaching has (2) ______ wavelength

s.
1) a. longer b. higher c. shorter

2) a. lower b. Longer c. shorter
Biology
2 answers:
noname [10]3 years ago
6 0
FIRST one (shorter)

SECOND one (longer)
Papessa [141]3 years ago
5 0
<h3><u>Answer;</u></h3>

A. Longer

C. Shorter

The sound of a police siren that is moving away has <u>shorter</u> wavelengths, and one that is approaching has <u>longer</u> wavelengths.

<h3><u>Explanation;</u></h3>
  • The pitch of the sound heard depends on the frequency of the sound wave. A higher frequency corresponds to a high pitch. Therefore, when the police siren is approaching an observer, the observed frequency increases and thus the observer hears a higher pitch.
  • <em><u>Conversely, when the police siren is moving away from an observer, then the frequency decreases and thus, the pitch of the sound heard is lower.</u></em>
  • <em><u>A higher frequency corresponds to a shorter wavelength, therefore, the shorter the wavelength, the higher the frequency, and the higher the pitch, of the sound.</u></em>
You might be interested in
The hay included as part of the culture medium provided a food source for bacteria. Bacteria are a good food source for some typ
lions [1.4K]

Answer:

  • Protozoans → would not have survived because they have no way to produce their own food → Heterotrophs
  • Algae → would have survived without this food source → Heterotrophs

Explanation:

The protist kingdom is composed of two main groups.  The principal difference between them is that algae can produce their own food, while protozoans need to ingest other organisms or organic molecules to survive.

  • Algaes are autotroph
  • Protozoans are heterotroph

<u>Protozoans</u>:

Microscopic unicellular organisms, eukaryotic and heterotrophs -predators or detritivores-. Most of them are aquatic free-living organisms, but some species are parasites. They feed on<u> bacteria</u>, other organic wastes, and other microscopic organisms. The phagocytosis process is normally used to ingest the food, invaginating their cell membrane.  

<u>Algae</u>:

Eukaryotic micro- or macroscopic organisms. Autotroph and photosynthetic. They might be either unicellular or pluricellular. They use sunlight to synthesize organic matter from water, CO₂, and mineral salts. Unicellular ones can be free-living or associate with others to form colonies. They are part of the phytoplankton and are ingested by heterotrophic organisms. Pluricellular algae do not create real tissues but they compose a tale. The depth at which they inhabit depends on the pigments they produce. All of them inhabit fresh or sea waters.

8 0
3 years ago
1) The molecule that serves as the major source of readily available fuel for neurons and blood cells is ________.
Talja [164]
Glucose, your answer would be B.
7 0
3 years ago
In a study of genetic variation of the Graceland gene, a researcher finds that there are two alleles in a population. In a large
Licemer1 [7]

Answer:

Option 1, No. The highest frequency of heterozygotes under Hardy-Weinberg equilibrium is 0.5

Explanation:

As per Hardy Weinberg’s equilibrium principle, the maximum frequency of heterozytotic individuals occur only when half of the population is dominant and recessive homozygous.  

In other way when the sum of frequency of dominant and recessive species is equal to 0.5, only then the frequency of heterozygotes is maximum which in any case would not be higher than 0.5.  

Hence, option 1 is correct

7 0
3 years ago
How do genetics use Punnett squares
antoniya [11.8K]

Answer:

Explanation:

It can be used to predict the outcomes of genetic crosses. How do geneticists use Punnett squares? They can be use to predict and compare the genetic variations that will result from a cross. Diagram showing the gene combinations that might result from a genetic cross.

5 0
3 years ago
Witch one of earths layers are the thinnest
mars1129 [50]
The earth is divided into four main layers: the solid crust on the outside, the mantel, the outer core and the inner core. out of them, the crust is the thinnest layer of the earth, amounting for less than 1% of our planet's volume. hope this helps!
6 0
3 years ago
Other questions:
  • Describe a sea-level regression.
    14·1 answer
  • How do cells release <br> Energy in the process of cellular respiration
    15·1 answer
  • What the similarities between mid ocean ridge and trenches?
    10·1 answer
  • I need help!
    11·2 answers
  • What is the simplification of 10/15​
    10·2 answers
  • What are the products of cellular respiration ?
    14·1 answer
  • In humans, a combination of XX chromosomes results in a female zygote and that of XY results in a male zygote. From whom does a
    5·2 answers
  • Each transfer RNA requires at least four specific recognition sites that must be inherent in its tertiary structure in order for
    12·1 answer
  • Place the Elodea cell in the ISOTONIC beaker. What happened to the cell? Question 4 options: It swelled It shrunk Nothing, it st
    12·1 answer
  • When a cross is made between AaBb x AaBb, what fraction of the offspring is able to produce a genotype that is heterozygous for
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!