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Jet001 [13]
3 years ago
13

A laser emits a beam of light whose photons all have the same frequency. When the beam strikes the surface of a metal, photoelec

trons are ejected from the surface. What happens if the laser emits twice the number of photons per second
Physics
1 answer:
seraphim [82]3 years ago
3 0

Answer:

the no. of ejected electrons per second will increase.

Explanation:

In photoelectric effect, when a light is incident on a metal surface it ejects some electrons from the metal surface. The energy of photon of light must be equal to or greater than the work function of that metal. All the extra energy above the work potential appears as the kinetic energy of the ejected electrons. So, greater he energy of photon greater will be the kinetic energy of the ejected electrons.

A single photon interacts with a single electron and ejects it only if its energy is greater than work function. So, the increase in no. of photons per second means an increase in the intensity of laser beam. And greater no. of photons, will interact with greater no. of electrons. So, <u>the no. of ejected electrons per second will increase.</u>

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A glass rod that has been charged to +12.0 nC touches a metal sphere. Afterward, the rod's charge is +8.0 nC. a) What kind of ch
SpyIntel [72]

Answer:

Explanation:

charge transferred to sphere = 12 - 8 = 4 nC

a )

The positive charge is decreased on glass rod , that means electrons must have entered the glass rod from the sphere which reduces its positive charge.

b )

charge transferred = 4 nC = 4 x 10⁻⁹ C

charge on one electron = 1.6 x 10⁻¹⁹ C

No of electrons transferred

= Total charge transferred / charge on one electron

= 4 x 10⁻⁹ / 1.6 x 10⁻¹⁹

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WHAT STEPS CAN YOU TAKE IF YOU BEEN A VICTIM OF ASSAULT
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3 0
3 years ago
. A whale swims due east for a distance of 6.9 km, turns around and goes due west for 1.8 km, and finally turns around again and
lara31 [8.8K]

Answer:

a) 12.4 km

b) 8.8 km

Explanation:

a) Distance is the total space covered by an object in its entire journey.

So, distance = 6.9+1.8+3.7 = 12.4 km

Distance travelled by the whale is 12.4 km

b) Displacement is the minimum distance between the final and initial point of the journey.

Let us take direction towards East as positive and direction towards west positive.

So, Displacement is given by

6.9-1.8+3.7 = 8.8 km

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4 0
3 years ago
Two planes approach each other head-on. Each has a speed of and they spot each other when they are initially 10.0 km apart. How
vovangra [49]

Answer:

23.08 seconds

Explanation:

The computation of the time required is shown below

Relative Velocity,V is

= 780 - ( - 780)    

= 1560 km/h

As it is moving in inverse or an opposite direction

And, the Distance, D = 10 km

So the time is

t = \frac{D}{V}

= \frac{10}{1560}          

= 0.00641 hours

= 0.00641 \times 3600\ seconds

= 23.08 seconds

By dividing the distance from the relative velocity we can get the time and the same is to be taken in the computation part

4 0
3 years ago
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