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3 years ago

Opal is making a list of the uses of electromagnetic radiation. Which of the following should Opal NOT include in her list?

Physics

2 answers:

Ugo [173]3 years ago

8 0

Answer:

Explanation:

A man using a microwave to boil water

Georgia [21]3 years ago

7 0

Answer:

Explanation:

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Why does icing sugar dissolve more rapidly than granular sugar?

kogti [31]

Icing sugar has a larger surface area meaning smaller particles allowing it to dissolve faster

3 0

4 years ago

An electron in an electron gun is accelerated from rest by a potential of 25 kV applied over a distance of 1 cm.

podryga [215]

Answer:

$9.38\times 10^7 m/s$

Explanation:

We are given that

Potential ,V=25 kV= $25\times 10^3 V$

Distance,r =1 cm= $\frac{1}{100}=0.01 m$

1 m=100 cm

Mass of electron, m= $9.1\times 10^{-31} kg$

Charge, q= $1.6\times 10^{-19} C$

We have to find the final velocity of the electron.

Speed of electron, $v=\sqrt{\frac{2qV}{m}}$

Using the formula

$v=\sqrt{\frac{2\times 1.6\times 10^{-19}\times 25\times 10^3}{9.1\times 10^{-31}}$

v= $9.38\times 10^7 m/s$

Hence, the final velocity of the electron= $9.38\times 10^7 m/s$

3 0

4 years ago

Snow and sleet when they fall to the ground is solar energy or gravitational force?

Nikolay [14]

Gravitational energy

3 0

3 years ago

A sports car starts from rest it covers a distance of 900 m to attain a speed of 80m s determine the acceleration of the car and

Lady bird [3.3K]

The acceleration of the car and the time required to reach this speed will be 8 m/s² and 10 sec.

<h3>What is acceleration?</h3>

The rate of velocity change concerning time is known as acceleration.

Given data;

Initial velocity, u=0 m/s

Final velocity, v= 80 m/sec

Distance travelled,s =900m

From Newton's third equation of motion;

v²=u²+2as

a =(v²-u²)/2s

Substitute the given values;

a = (80²-0)/2 ×900

a = 6400/1800

a=8 m/s²

The time required to reach this speed is found in Newton's first equation of motion as;

v = u+at

Substitute the given values;

80 = 0 + 8t

t=80/8

t = 10 sec

Hence, the acceleration of the car and the time required to reach this speed will be 8 m/s² and 10 sec.

To learn more about acceleration, refer to the link brainly.com/question/2437624

#SPJ1

5 0

2 years ago

A magnesium surface has a work function of 2.65 eV. Electromagnetic waves with a wavelength of 280 nm strike the surface and eje

Neko [114]

Answer:

Explanation:

Energy of radiation in eV = 1237.5/280 = 4.42 eV.

Work function = 2.65 eV.

Maximum kinetic energy = 4.42 - 2.65 = 1.77 eV.

8 0

4 years ago