PHYSICS HIGH SCHOOL

A beam of light has a wavelength of 4.5 × 10^−7meter in a vacuum. The frequency of this light is
(1) 1.5 × 10^−15 Hz (3) 1.4 × 10^2 Hz
(2) 4.5 × 10^−7 Hz (4) 6.7 × 10^14 Hz

Answers

Answer 1
Answer:

Wavelength formula is C=λf or λ=C/f or f = C/λ, so Frequency = Velocity divided by wavelength, where C is the velocity, which is the speed of light: 3.00×108 m/sec

λ is the wavelength in meters
f is the frequency in Hertz (cycles per second)
f=3.00×108msec/4.5x10−7m=6.7x1014Hz

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Mary walked north from her home to Sheila's home, which is 4.0 kilometers away. Then she turned right and walked another 3.0 kilometers to the supermarket, which is 5.0 kilometers from her own home. She walked the total distance in 1.5 hours. What were her average speed and average velocity?
A chunk of aluminum at 91.4°C was added to 200.0 g of water at 15.5°C. The specific heat of aluminum is 0.897 J/g°C, and the specific heat of water is 4.18 J/g°C. When the temperature stabilized, the temperature of the mixture was 18.9°C. Assuming no heat was lost to the surroundings, what was the mass of aluminum added?
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Displacement vectors of 5 km north, 3 km east, 2 km south, and 3 km west combine to a total displacement of ___

Answers

The answer is A. 3 km north

Displacement (D) is the shortest distance from the initial to the final position.
In this example, distance is 5 km north - 2 km south = 3 km north (look at the image).

What are the variables of Boyle's law?pressure and number of molecules of gas
volume and temperature
pressure and temperature
volume and number of molecules of gas
pressure and volume

Answers

pressure and number of molecules of gas,volume and number of molecules of gas.

A 10,000-watt radio station transmits at 535 kHz.Determine the number of joules transmitted per second.

Answers

Answer:

Energy is 10,000 Joules.

Explanation:

It is given that, a 10,000 watt radio station transmits at 535 kHz. We have to write the number of joules transmitted per second.

We know that number of joules transmitted per second is called the power. Its SI unit is watts. Mathematically, the power of radio station is given by :

P=(W)/(t)

Where

W is the work done by radio station

t is the time taken.

According to relation :

1\ watt==(1\ Joule)/(1\ seconds)

So, 10,000\ watt==(10,000\ Joule)/(1\ seconds)

Hence, energy per second is 10,000 Joules.

If you are given a 10,000-watt radio station transmits at 535 kHz, then you just divide one by 535,000 Hz which is equal to 1.87 x 10^-6 seconds. Multiply this value by 10,000W and you get 0.019 Joules.

How are evaporation and sublimation similar?

Answers

Both involve the formation of gas  hope 

 

Both involve the formation of a gas.

The potential difference across wire is 75V and its electric resistance is 30Ω. Find out the electric current through the wire.

Answers

Answer:

current = 2.5A

Explanation:

We can use Ohm's law which states that V∝R so V=IR when the temperature is constant where V is the voltage (potential difference), I is the current and R is the resistance.

75= 30I

I= 75/30= 2.5A

As you move toward a warning siren, the pitch _____.increases
decreases
stays the same
disappears

Answers

Answer: Increases.

Explanation:

Warning siren is generally used to make people alert of danger. Danger can be anything associated with the health and hazard.

Warning siren can be due to tsunami, earthquake, fire, flood, et cetera. The pitch of siren is low when a person is afar from the siren.

As the person moves close to the siren, the pitch of siren increases.

Answer:

As you move toward the siren the pitch should get louder

Explanation:
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A radio wave has a frequency of 5.5 × 104 hertz and travels at a speed of 3.0 × 108 meters/second. what is its wavelength? a. 5.5 × 104 meters b. 5.0 × 103 meters c. 5.5 × 103 meters d. 3.0 × 108 meters
An increase in which quantity will result in an increase in momentum?