4
Q:

# Total internal reflection can take place when light travels from

 A) Air to glass B) Air to water C) Water to glass D) Diamond to glass

Explanation:
Subject: Physics
Q:

Visible light has a higher frequency than

 A) Radio waves B) X rays C) Ultra violet D) All the above

Explanation:

Radio waves have much longer wavelengths and lower frequencies than do visible light waves. In contrast, X-rays have much shorter wavelengths and higher frequencies.

Ultraviolet Light (UV). part of the electromagnetic spectrum that consists of waves with frequencies higher than those of visible light and lower than those of x-rays.

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1 56
Q:

In a vacuum, all electromagnetic waves have the same

 A) Velocity B) Wavelenth C) Frequency D) All the above

Explanation:

When traveling in a vacuum, electronic waves from the electromagnetic spectrum all travel at the same speed. Velocity is speed with direction, so they would all travel at the same velocity, realtively speaking. But frequency and wavelength are quite different.

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3 121
Q:

Is air homogeneous or heterogeneous?

 A) homogeneous B) heterogeneous C) Both A & B D) None of the above

Explanation:

A Mixture is a material made up of two or more different substances which are mixed.

Mixtures can be either homogeneous or heterogeneous.

* A homogeneous mixture is a type of mixture in which the composition is uniform and every part of the solution has the same properties.

* A heterogeneous mixture is a type of mixture in which the components can be seen, as there are two or more phases present.

Air is a homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances.

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0 84
Q:

Sound waves cannot travel in

 A) Vacuum B) Water C) Glass D) Hydrogen gas

Explanation:

A Sound wave needs a medium for propogation. Hence, Sound cannot travel through a vacuum.

A vacuum is an area without any air, like space. So sound cannot travel through space because there is no matter for the vibrations to work in.

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0 162
Q:

Resistance of human body in dry condition

 A) 10 ohm B) 1000 ohm C) 10000 ohm D) 100000 ohm

Explanation:

Under dry conditions, the resistance offered by the human body may be as high as 100,000(10^5) Ohms.

Depending on the person, a rough value for the internal resistance of the human body is 300-1,000 Ohms. The skin's resistance is much lower if it is wet or burnt/blistered.

There are a lot of factors involved and not every person has the same electrical resistance. For instance, men tend to have lower resistance than women.

Within the body, the tissues with the greatest resistance are bone and fat - nerves and muscle have the least resistance.

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0 102
Q:

Q = mc∆T refers to

 A) Enthalpy formula B) Heat Transfer formula C) Specific Heat formula D) Heat of Vaporization

Explanation:

Q = mc∆T refers to Specific Heat formula.

When heat energy is added to a substance, the temperature will change by a certain amount.

The relationship between heat energy and temperature is different for every material, and the specific heat is a value that describes how they relate.

Q = mc∆T

Q = heat energy (Joules, J)

m = mass of a substance (kg)

c = specific heat (units J/kg∙K)

∆T = change in temperature (Kelvins, K)

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0 133
Q:

Acceptable noise level for human ear

 A) > 85 db B) = 85 db C) < 85 db D) None of the above

Explanation:

Sound intensity or level is measured by a unit called a decibel. An 85 decibel noise level is not a safe standard for the public.

Hence, Acceptable noise level for human ear is less than 85 db.

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2 82
Q:

Atmospheric pressure exerted on earth is due to

 A) gravitational pull B) rotation of earth C) revolution of earth D) uneven heating of earth

Explanation:

The atmospheric pressure at the surface of the Earth is due to gravitational pull of the earth and is about 14.7 psi.

That means that the weight of a column of air which has a cross section of 1 square inch and which stretches from the surface of the Earth to space is 14.7 pounds.