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Alika [10]
4 years ago
7

A photosensitive surface is illuminated with both blue and violet light. the light that will cause more electrons to be ejected

is the
Physics
1 answer:
Vikki [24]4 years ago
8 0
The correct answer is "they cause the same number of electrons to be ejected".

In fact, in the photoelectric effect, the number of photoelectrons emitted does not depend on the frequency of the light, but only on its intensity. The frequency of the light affects only the kinetic energy of the photoelectrons, because each photon carries an energy of
E=hf
where h is the Plank constant and f is the frequency of the wave, and then this energy is converted into kinetic energy of the photoelectron. But the number of photoelectrons emitted depends only on the number of incoming photons, so it depends only on the intensity of the light. Therefore, violet and blue light cause the emission of the same number of photoelectrons.
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A ‘can-chiller’ is used to make a can of drink colder. The initial temperature of the liquid in the can was 25.0 °C. The can-chi
Helen [10]

Answer:

4200 J/°C/kg

Explanation:

The formula for heat transfer is given by :

Q= m*c*ΔT  where;

Q= heat transferred = 6930 J

m=mass of the liquid = 0.330 kg

c= specific heat capacity=?

ΔT = 25-20 = 5.0°C

Applying the values in the formula as;

Q= m*c*ΔT

6930 = 0.330 * c * 5

6930 = 1.65 c

6930/1.65 = c

4200 = c

c= 4200 J/°C/kg

6 0
3 years ago
How long does it take the sun to melt a block of ice at 0âc with a flat horizontal area 1.0 m2 and thickness 1.8 cm ? assume tha
snow_lady [41]
At least 20-30 seconds
3 0
4 years ago
A challenge gaining prominence throughout the planet is the increased need for \"green\" or sustainable energy. in certain parts
Inga [223]

32.6% of 1.4 Mw

= (0.326) x (1,400,000 joules/second)

=  456,400 joules/second .


1 year

=  (365 da) x (86,400 sec/da)  =  31,536,000 seconds


(456,000 joules/sec) x (31,536,000 sec)  =  1.438 x 10¹³ Joules 

(That's 1.438 x 10⁷ Megajoules, or 3,994,560 kWh)


5 0
4 years ago
Read 2 more answers
A quantity of 30.1 cm^3 of water at 22.4°C is placed in a freezer compartment and allowed to freeze to solid ice at -7.2°C. How
iogann1982 [59]

Answer:

13330.86 J

Explanation:

mass of volume of 30.1 cc of water = density x volume

= 1 x 30.1 = 30.1 gm

= 30.1 x 10⁻³ kg

Heat to be withdrawn to cool water from 22.4 degree to 0 degree

= mass x specific heat x fall of temperature

= 30.1 x 10⁻³ x 4186 x 22.4

= 2822.36 J

Heat to be withdrawn to cool water  0 degree ice

mass x latent heat of freezing

30.1 x 10⁻³ x 334000

= 10053.4 J

Heat to be withdrawn to cool ice from 0 degree to -7.2 degree

mass x specific heat of ice x fall of temperature

= 30.1 x 10⁻³ x 2100 x 7.2

= 455.1 J

Total heat to be withdrawn

=  2822.36  + 10053.4 + 455.1

= 13330.86 J

6 0
4 years ago
50N force accelerated a body at a rateof 8 metres per second square. Calculate the mass of the body​
Natalka [10]

Answer:

m=6.25kg

Explanation:

Force= mass × acceleration

50=m×8

make m subject of the formula...

m=50/8

m=6.25kg

3 0
4 years ago
Read 2 more answers
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