Photoelectric Effect and Energy Calculations

The video tutorial introduces the Doubt and app, which provides instant video solutions for math, physics, chemistry, and biology questions. It then presents a question on the photoelectric effect, involving a light frequency and a metal's work function. The tutorial explains the constants and units needed, such as Planck's constant and electron volts, and demonstrates how to calculate the maximum energy of emitted electrons. The solution involves converting the energy to electron volts and concludes with the final answer. The video ends with a promotion of the Doubt and app.

What is the main feature of the Doubt and App?

• Provides instant video solutions to academic doubts

• Offers live tutoring sessions

• Conducts online exams

• Sells educational books

What is the frequency of the light mentioned in the problem?

• 6 x 10^14 Hz

• 5 x 10^14 Hz

• 7 x 10^14 Hz

• 8 x 10^14 Hz

What is the work function of the metal in the problem?

• 3 electron volts

• 2 electron volts

• 1 electron volt

• 4 electron volts

Which constant is used in the formula for maximum energy in the photoelectric effect?

• Gravitational constant

• Planck's constant

• Avogadro's number

• Boltzmann's constant

What is the formula for calculating the maximum energy of emitted electrons?

• E = hν - φ

• E = kT

• E = mc^2

• E = Fd

What is the value of Planck's constant used in the calculation?

• 1.38 x 10^-23 J·s

• 9.81 x 10^-34 J·s

• 6.02 x 10^23 J·s

• 6.63 x 10^-34 J·s

How is the energy converted from joules to electron volts?

• By multiplying by 1.6 x 10^-19

• By dividing by 1.6 x 10^-19

• By subtracting 1.6 x 10^-19

• By adding 1.6 x 10^-19

What is the calculated maximum energy of the emitted electrons in electron volts?

• 0.49 eV

• 1.49 eV

• 3.49 eV

• 2.49 eV

What is the final answer for the maximum energy of the emitted electrons?

• 1.49 electron volts

• 0.49 electron volts

• 2.49 electron volts

• 3.49 electron volts

What is the main purpose of the Doubt and App as mentioned in the conclusion?

• To assist students from class 6 to 12 with academic doubts

• To provide entertainment content

• To offer language learning courses

• To sell educational merchandise