Embibe Experts Solutions for Chapter: Dual Nature of Matter and Radiation, Exercise 1: BEGINNER'S BOX - 1

Who discovered the photoelectric effect?

$\left(1\right)$ Hertz $\left(2\right)$ Lenard $\left(3\right)$ Hallwach $\left(4\right)$ Einstein

The energy of a photon is equal to $3 \mathrm{keV}$. Calculate its linear momentum?

Which colour of the photon has greater energy either red or violet?

A TV station is operated at $100 \mathrm{MW}$ with a signal frequency of $10 \mathrm{MHz}$. Calculate the number of photons radiated per second by its antenna.

Calculate a number of photons passing through a ring of the unit area in unit time if the light of intensity $100 \mathrm{W} {\mathrm{m}}^{-2}$ and of wavelength $400 \mathrm{nm}$ is falling normally on the ring.

A special kind of light bulb emits monochromatic light of wavelength $700 \mathrm{nm}$. Electrical energy supply to it at the rate of $60 \mathrm{W}$ and the bulb is $50 \%$ efficient at converting that energy to light energy. How many photons are emitted by the bulb during its lifetime of $1 \mathrm{day}$.