All categories

3 years ago

What type of electromagnetic wave is used in security pens?

Biology

2 answers:

kondaur [170]3 years ago

4 0

The answer is; UV (ultraviolet)

The security pens use UV light to illuminate some marking on an object,such as a watermark, to identify its authenticity or owner. The markings are usually invisible to the naked eye under visible light. The marks are only visible when illuminated with UV light. This is because the marking is made of a fluorescent material that absorbs light of a shorter wavelength (this case UV) and emits a longer wavelength (this case visible light).

aivan3 [116]3 years ago

4 0

The ultraviolet rays are a type of electromagnetic wave that is used in security pens.

Further Explanation:

The electromagnetic waves are propagated by instantaneous periodic variation of the magnetic field and electric field intensity. They include visible light, infrared, gamma rays, radio waves, and ultraviolet rays. When the spectrum of light is passing through the prism, then they differentiate into a different color of the rainbow.

Ultraviolet lights are invisible to naked human eyes. The primary source of ultraviolet light is a sun that is differentiated into three different forms UV-A, UV-C, and UV-B. UV-B and UV-C are most harmful and can cause cellular damage to the living organism.UV lights are used in security pens to highlight the marking on the object for security purposes or to identify the owner easily. They can easily absorb light of short wavelength and have a higher frequency. Their wavelength is shorter than the visible lights.

Learn more:

1. Learn more about collagen disease brainly.com/question/2947334

2. Learn more about subatomic particle brainly.com/question/3176193

3. Learn more about electron brainly.com/question/1832385

Answer Details:

Grade: High School

Subject: Biology

Topic: Radiations

Keywords:

Ultraviolet rays, spectrum, visible light, infrared, differentiate, UV-A, UV-B, UV-C, light, higher frequency, human eyes, pen, security, sun.

You might be interested in

Which amino acid--a, b, or c--actually falls between the other two in lysozyme primary structure (the order of the amino acids i

goldenfox [79]

Answer:

Explanation:

8 0

3 years ago

In a certain species of plant, the allele to produce green melons (G) is dominant over the allele to produce yellow melons (g).

marishachu [46]

Answer:

4.26

Explanation:

Let the green-melon parents be Gg, then we expect the cross with the yellow-melon plant gg so as to produce 50% Gg and other 50% of gg offspring. What we observed was that 53 green and a 41 yellow. Based on the total number of 94 offspring , we expected half and a half ratios to be 47 of each color.

Observed(o) Expected(e) (o-e) $(o-e)^2$ $(o-e)^2/e$

Green-melon plant 53 47 6 36 0.766

Yellow-melon plant 41 47 -6 36 0.766

Therefore the chi-square value is 1.53 which is less than the critical value of 3.84. Therefore, the null hypothesis is accepted.

4 0

3 years ago

Atoms are held together in a molecule by __________________ bonds.

spayn [35]

Answer:

by convalent bonds

Explanation:

8 0

4 years ago

Which best defines a diploid cell during meiosis?

Lubov Fominskaja [6]

Diploid cells. Meiosis is the process of cell division by which involving gametes. Cell division is just the same for sperm and egg cells, but they have distinguishable descriptions and labels in the process. Spermatogenesis is for the males’ sperm cells and oogenesis is the process for females’ egg cells. The cell division of meiosis involves the two phases, respectively meiosis I and meiosis II. Meiosis I like mitosis is the cell division that produces diploid cells. These diploid cells are cells that contain a complete pair of chromosomes which is 46. The result is two diploid cells after the first meiosis. To provide clear explanation, in contrast haploid cells only contain 23 chromosomes and are created after meiosis II which is 4 in number.

6 0

4 years ago

The process of DNA replication

Molodets [167]

Answer: Replication occurs in three major steps: the opening of the double helix and separation of the DNA strands, the priming of the template strand, and the assembly of the new DNA segment. During separation, the two strands of the DNA double helix uncoil at a specific location called the origin. Several enzymes and proteins then work together to prepare, or prime, the strands for duplication. Finally, a special enzyme called DNA polymerase organizes the assembly of the new DNA strands. The following description of this three-stage process applies generally to all cells, but specific variations within the process may occur depending on organism and cell type.

Explanation:

7 0

3 years ago