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4 years ago

2 QUESTIONS 20 POINTS

Physics

2 answers:

irina [24]4 years ago

7 0

I think 1 is x-rays and 2 is ultraviolet light.. I'm not that sure

stich3 [128]4 years ago

3 0

Just finished completitng this kind of info in the course that I am taking! X-rays contain the most energy, and microwaves would have the longest wavelength.

Higher frequency= more energy

If you want to add it to your notes, this is EMR listed in order from highest frequency/highest energy, to lowest frequency/ lowest energy.

Gamme rays, X-rays, UV, Visible light, Infrared, Microwave, and radio waves.

So, Gamme rays have the highest energy and frequency, and radio waves havethe lowest.

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Car A and Car B approach each other

vagabundo [1.1K]

The original frequency of horn of Car A is 1071 Hz.

Explanation:

Doppler effect describes the change in the frequency of sound waves with respect to the observer. As the sound waves emitted from a source need to travel the air medium to reach observer, it will undergo loss in energy. So there will be change in its frequency compared to original frequency. Depending upon the direction of travel of source and observer the shifting of frequency will vary.

$f'=\frac{v-v_{o} }{v-v_{s} } f$

Here vo is the observer velocity and vs is the velocity of the source. So Vo = 15 m/s as car B is the observer and Vs = 35 m/s as car A is the source. And f is the frequency of sound wave at source that is car A.

Similarly, the doppler shift in frequency is the frequency of sound heard by car B which is f' = 1140 Hz. And v is the speed of sound that is v = 343 m/s

1140 = $\frac{343-15}{343-35}*f= 1.0649 *f$

f = 1140/1.0649= 1071 Hz.

Thus, the original frequency of horn of Car A is 1071 Hz.

3 0

4 years ago

When the valve between the 2.00-L bulb, in which the gas pressure is 2.00 atm, and the 3.00-L bulb, in which the gas pressure is

padilas [110]

Answer:

$P_{C} = 3.2\, atm$

Explanation:

Let assume that gases inside bulbs behave as an ideal gas and have the same temperature. Then, conditions of gases before and after valve opened are now modelled:

Bulb A (2 L, 2 atm) - Before opening:

$P_{A} \cdot V_{A} = n_{A} \cdot R_{u} \cdot T$

Bulb B (3 L, 4 atm) - Before opening:

$P_{B} \cdot V_{B} = n_{B} \cdot R_{u} \cdot T$

Bulbs A & B (5 L) - After opening:

$P_{C} \cdot (V_{A} + V_{B}) = (n_{A} + n_{B})\cdot R_{u} \cdot T$

After some algebraic manipulation, a formula for final pressure is derived:

$P_{C} = \frac{P_{A}\cdot V_{A} + P_{B}\cdot V_{B}}{V_{A}+V_{B}}$

And final pressure is obtained:

$P_{C} = \frac{(2\,atm)\cdot (2\,L)+(4\,atm)\cdot(3\,L)}{5\,L}$

$P_{C} = 3.2\, atm$

5 0

3 years ago

According to most car mechanics, plain water is the best coolant to use in an engine provided the engine is not being exposed to

Gelneren [198K]

Ethylene glycol reduces the cooling efficiency of water because it has a lower heat capacity as compared to water. A substance with low heat capacity would mean that the material only needs a small amount of energy to increase its temperature. So, for ethylene glycol, the heat transfer would be faster decreasing the cooling efficiency.

8 0

3 years ago

Explain what was ultimately responsible for London’s “killer fog” in 1952.

stellarik [79]

Answer:

possible answer from edge

Explanation:

After World War II the only coal available to burn residentially, either for cooking or warmth, was of poor quality and contained large amounts of contaminants that made its fumes toxic. So when millions of homes in London burned this low quality coal and the local atmosphere over and around London stagnated, there was nowhere for the fumes to go. This stagnation allowed the toxic coal fumes to build up until they became physically harmful to humans and animals.

6 0

3 years ago

Read 2 more answers

________ found that electric and magnetic energy move in waves.

GrogVix [38]

<span>James Clerk Maxwell is the answer</span>

8 0

4 years ago