PHYSICS HIGH SCHOOL

A radio station transmits waves at a frequency of 120MHz an a speed of 300 million m/s. Calculate the wavelength.

Answers

Answer 1
Answer: wavelength = (speed)/(frequency) = 300,000,000/120,000,000 = 2.5 meters

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In the winter activity of tubing, riders slide down snow covered slopes while sitting on large inflated rubber tubes. To get to the top of the slope, a rider and his tube, with a total mass of 80 kg, are pulled at a constant speed by a tow rope that maintains a constant tension of 360 N. How much thermal energy is created in the slope and the tube during the ascent of a 30-m-high, 120-m-long slope?

Can solar energy turn into sunlight?

Answers


Nothing has to turn.

Sunlight IS solar energy !

Which statement best describes perigee?A. The closet point in the Moon's orbit to Earth
B. The farthest point in the Moon's orbit to Earth
C. The closest point in Earth's orbit of the Sun
D. The Sun's orbit that is closest to the Moon

Answers

Answer:

A. The closest point in the Moon's orbit to Earth

Explanation:

The perigee is defined as the closest point in the orbit of an object (such as a satellite) from the centre of the Earth. In this case, the Earth's satellite is the Moon, so the perigee is defined as the closest point in the Moon's orbit to Earth. so option A is the correct one.

Let's see instead the names of the other options:

B. The farthest point in the Moon's orbit to Earth  --> this point is called apogee

C. The closest point in Earth's orbit of the Sun  --> this point is called perihelion

D. The Sun's orbit that is closest to the Moon --> this point has no specific name
A. The closet point in the Moon's orbit to Earth

Hope I helped:P

A beam of light has a wavelength of 506 nanometers. What is the frequency of the light? What colors is the light?

Answers

Beam Light wavelength = 506 nanometer
Frequency of light = F
The color of light = L

To fine the electromagnetic field:
=> S = wavelength x Frequency
Frequency = (3 x 10^8) / (5.06 x 10^ -7)
F = 5.96 x 10^14 Hz

According to the visible light spectrum, wavelength from 495 to 570 is equals to the color of green. Since the given wavelength is 506, thus, the color of light is green.

F = 5.96 x 10^14 Hz
L = green

All of the following are long-term risks associated with exposure to secondhand smoke EXCEPT:a. increased risk of respiratory illness
b. increased risk of lung cancer
c. change in senses
d. increased risk of cardiovascular disease

In what year were cigarette packages made to include 6 warning labels that mentioned the surgeon general

Answers

All of the following are long-term risks associated with exposure to secondhand smoke EXCEPT:

A. increased risk of respiratory illness

B. increased risk of lung cancer

C. change in senses

D. increased risk of cardiovascular disease

This is the Correct Answer.
The answer is D.
Cardiovascular diseases are a result of a sedentary lifestyle and a poor diet. Secondhand smoke is not a risk factor for CV diseases. The other choice except letter D are long term risks associated with exposure to secondhand smoke. A person should stay away from people who are smokers so as not to obtain these possible complications within the body. Air filters in cigarettes are not present in the air which make chemical exposures at a higher level for people who are secondhand smokers compared to smokers themselves.

Your boss asks you to design a room that can be as soundproof as possible and provides you with three samples of material. The only information on each sample's label is the material's coefficient of absorption. The coefficient of absorption listed on Sample A is 30%, on Sample B is 47%, and on Sample C is 62%. When your boss asks for your choice and the reasoning behind it, what would you tell him? A. Sample A would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest.
B. Sample A would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the largest.
C. Sample C would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest.
D. Sample C would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the largest.

Answers

Answer: Option C: Sample C would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest.

Explanation:

The absorption coefficient of the samples is given. Sample A has 30%, Sample B has 47% and Sample C has 62%. This means that sample C absorbs the most percentage of energy incident on it. The energy in the reflected wave would be least. Hence, it would be best to use for a room to make it soundproof.


The correct answer is Option C) Sample C would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest.


As the coefficient of absorption would define the energy present in the reflected wave, the material C has the highest percentage of absorption i.e. 62% and would be best suitable to make a sound proof room.

Mechanical waves can travel through _______. vacuums only


both vacuums and mediums


mediums only

Answers

mediums only, mechanical waves always propagate through medium
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