Free Printable Planck's hypothesis and Photoelectric effect

1.

we described this motion using

a)

first law of Newton

b)

2nd law of Newton

c)

3rd law of Newton

d)

Newton is helpless.....

2.

To describe this electron motion in solid our approach would be

a)

we can not see the electron don't know how to describe

b)

lets take a chance to find out electron

c)

lets don't disturb electron

d)

need a very strong microscope

3.

An idea black body

a)

absorbs any radiation completely

b)

emits all radiation

c)

absorbs fully at low temp and emits fully at high temp

d)

absorbs fully and emits fully at a given temp

4.

This graph is emitted during heat of a black body, inference we draw are

a)

it initially increases, finally decrease

b)

the graph is similar to the spread of CORONA virus with moths

c)

it initially increases, finally decrease, passes through a maxm

d)

it initially increases, finally decrease, maxm. displaces with temp

5.

Which phenomenon of Black body radiation is shown here

a)

after blue the bulb becomes white

b)

after blue all infinite energy coming out

c)

at wave length below blue the expt. fails

d)

at low wave length infinite energies are coming out

6.

Main problem Ralyegh-Jeans theorem is

a)

it is connected with scattering of light

b)

it is good at very high wave lengths and fails at low wave length

c)

it is good at very low wave lengths and fails at high wave length

d)

it fails as lamda goes to zero

7.

which expt. is taking place here

a)

photoelectic effect

b)

compton effect

c)

reflection of light

d)

black body radiation

8.

which experiment is taking place?

a)

Phtoelectric effect

b)

Compton effect

c)

Reflection of light from electrons

d)

Black body radiation expt

9.

Main contribution of Planck in the development of Physics is

a)

Atoms in a solid are equivalent to charge harmonic oscillator

b)

Energy of an object should not be arbitrary rather discrete

c)

Energy of an object should not be arbitrary and would follow a definite formula

d)

Any object can have any energy

10.

Using Planck's low how do we remove UV catastrouphe

a)

expand exp series and apply limit $\lambda$ goes to zero

b)

expand exp series and apply limit $\lambda$ goes to infinity

c)

expand exp series and apply $\lambda$ large means hf/ $\lambda KT$ small

d)

expand exp series and apply $\lambda$ small means hf/ $\lambda KT$ large

11.

RJ law is $\frac{8\pi KT}{\lambda4}$

a)

We achieve it from Planck by using $\lambda>>\ means\ \frac{hc}{\lambda KT}<<\$

b)

$\lambda>>\ \frac{hc}{\lambda KT}\ \ also\ l\arg e$

c)

$\lambda\ goes\ to\ zero\ so\ \frac{hc}{\lambda KT}\ goes\ to\ \inf inity$

d)

$\lambda\ goes\ to\ \inf inifinity\ so\ \frac{hc}{\lambda KT\ }\ goes\ to\ zero$

12.

In this picture red balls are

a)

photon emitted

b)

photon absobed

c)

light wave emitted

d)

light wave absorbed

Planck's hypothesis and Photoelectric effect

Total questions: 12

Worksheet time: 6mins

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