Answer:
0.267 × 10⁻³
Explanation:
Given:
maximum permissible workday dose = 18 mrem
Weight of the laboratory technician = 54 kg
gamma rays absorbed = 2.6 mJ of 0.30 MeV
relative biological effectiveness (RBE) for gamma rays = 1.00
Now,
Radiation Absorbed Dose
also,
Roentgen Equivalent Man = rad × Q
here Q is the quality factor = 1 for gamma rays
thus,
Roentgen Equivalent Man = 4.8 × 10⁻³ × 1 = 4.8 × 10⁻³ rem
Therefore,
the ratio of the equivalent dosage received by the technician to the maximum permissible equivalent dosage will be
=
or
= 0.267 × 10⁻³
A possible source of indoor air pollution is a gas present in some carpets and furniture, which is Formaldehyde and VOCs .
Formaldehyde can cause Cancer due to its exposure through the Furniture. These cause pollution inside the room acting as Indoor Air pollution gas.
By the end of seven days the concentration of formaldehyde in household furniture can be brought back to normal in most of the cases.
Whereas it is also known that it takes about two years for a well furnished newly made home to bring down the levels of evolved gas i.e. formaldehyde.
The following types of cancers are prone due to Formaldehyde:
- Nose
- Throat
- Sinus
Some Volatile Organic Compounds (VOCs) are found in desks in office, cabinet furniture and several products available as furniture. These chemicals are used in manufacture of new carpets harming our health.
VOCs can be removed by using hot water of the given carpet. These cause pollution inside the room acting as Indoor Air pollution gas.
It usually takes two to three days to evolve off the gas.
Hence, a possible source of indoor air pollution is a gas present in some carpets and furniture, which is Formaldehyde and VOCs .
Learn more about Formaldehyde here, brainly.com/question/14299220
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Answer:
The correct answer is option B)
Explanation:
Considering the given question as -
The space shuttle is located exactly half way between the earth and the moon. Which statement is true regarding the gravitational pull on the shuttle? A) The moon pulls more on the shuttle. B) The earth pulls more on the shuttle. C) Both are equal due to equal distances. D) Both are equal due to the mass of the shuttle.
We know that gravitational pull (F) between any two bodies of mass and is given by -
F = where 'r' is the distance between the two bodies.
Let ,
: Mass of the earth
: Mass of the moon
m : Mass of the satellite
: Distance of satellite from earth
: Distance of satellite from moon
Given that =
Let ==r
Force on satellite by the earth is -
=
Force on satellite by the moon is -
=
∵ Mass of earth () > Mass of moon ()
∴ >
∴ The gravitational pull of earth on satellite is more than that of the moon.
Answer:
Induced emf,
Explanation:
It is given that,
Rate of change of magnetic field,
A UHF antenna is oriented at an angle of 47° to a magnetic field, θ = 47°
Diameter of the antenna, d = 13.4 cm
Radius, r = 6.7 m = 0.067 m
We need to find the induced emf of the antenna. It is given by :
Where
= magnetic flux,
So,
B = magnetic field
So, the induced emf of the antenna is 2.2 mV. Hence, this is the required solution.
We can use Newton's second law to find out. This says F=ma, where m is the mass we seek:
So we see the mass is 3kg