Physics-

General

Easy

### Question

#### a) Name the experiment for which the adjacent graph, showing the variation of intensity of scattered electrons with the angle of scatter ing (q) was obtained.

b) Also name the important hypothesis that was confirmed by this experiment

- a) Davission and Germer experiment b) de Broglie hypothesis
- a) Photo electric effect b) de Broglie hypothesis
- a) Thermionic emission b) de Broglie hypothesis
- a) Photocell

#### The correct answer is: a) Photo electric effect b) de Broglie hypothesis

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### Related Questions to study

physics-

#### Three identical particles are joined together by a thread as shown in figure. All the three particles are moving in a horizontal plane. If the velocity of the outermost particle is , then the ratio of tensions in the three sections of the string is

Let is the angular speed of revolution

#### Three identical particles are joined together by a thread as shown in figure. All the three particles are moving in a horizontal plane. If the velocity of the outermost particle is , then the ratio of tensions in the three sections of the string is

physics-General

Let is the angular speed of revolution

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#### A ball of mass kg is attached to the end of a string having length 0.5 m. The ball is rotated on a horizontal circular path about vertical axis. The maximum tension that the string can bear is 324 N. The maximum possible value of angular velocity of ball (in rad/s) is

component will cancel

Component will provide necessary centripetal force the ball towards center

Component will provide necessary centripetal force the ball towards center

*C.*#### A ball of mass kg is attached to the end of a string having length 0.5 m. The ball is rotated on a horizontal circular path about vertical axis. The maximum tension that the string can bear is 324 N. The maximum possible value of angular velocity of ball (in rad/s) is

physics-General

component will cancel

Component will provide necessary centripetal force the ball towards center

Component will provide necessary centripetal force the ball towards center

*C.*maths-

#### The ellipse and the straight line y = mx + c intersect in real points only if

= 1

Þ (b

D > 0 Þ m

Þ (b

^{2}+ a^{2}m^{2}) x^{2}+ 2 mca^{2}x + a^{2}(c^{2 }- b^{2}) = 0D > 0 Þ m

^{2}c^{2}a^{4}- a^{2}(c^{2}- b^{2})(b^{2}+ a^{2}m^{2}) > 0 Þ b^{2}+ a^{2}m^{2}> c^{2}#### The ellipse and the straight line y = mx + c intersect in real points only if

maths-General

= 1

Þ (b

D > 0 Þ m

Þ (b

^{2}+ a^{2}m^{2}) x^{2}+ 2 mca^{2}x + a^{2}(c^{2 }- b^{2}) = 0D > 0 Þ m

^{2}c^{2}a^{4}- a^{2}(c^{2}- b^{2})(b^{2}+ a^{2}m^{2}) > 0 Þ b^{2}+ a^{2}m^{2}> c^{2}physics-

#### Four capacitors are connected as shown in figure. The equivalent capacitance between and is

Capacitance between A and B

#### Four capacitors are connected as shown in figure. The equivalent capacitance between and is

physics-General

Capacitance between A and B

physics-

#### A frictionless track ends in a circular loop of radius figure. A body slides down the track from point which is at a height cm. Maximum value of for the body to successfully complete the loop is

For successfully completing the loop,

#### A frictionless track ends in a circular loop of radius figure. A body slides down the track from point which is at a height cm. Maximum value of for the body to successfully complete the loop is

physics-General

For successfully completing the loop,

physics-

#### In a circuit shown in figure, the potential difference across the capacitor of 2 F is

#### In a circuit shown in figure, the potential difference across the capacitor of 2 F is

physics-General

physics-

#### The effective capacitance between points and shown in figure. Assuming F and that outer capacitors are all F is

The arrangement shows a Wheatstone bridge.

As therefore the bridge is balanced.

Similarly,

effective capacitance

As therefore the bridge is balanced.

Similarly,

effective capacitance

#### The effective capacitance between points and shown in figure. Assuming F and that outer capacitors are all F is

physics-General

The arrangement shows a Wheatstone bridge.

As therefore the bridge is balanced.

Similarly,

effective capacitance

As therefore the bridge is balanced.

Similarly,

effective capacitance

physics-

#### The four capacitors, each of 25 F are connected as shown in figure. The DC voltmeter reads 200 V. the change on each plate of capacitor is

Charge on each plate of each capacitor

#### The four capacitors, each of 25 F are connected as shown in figure. The DC voltmeter reads 200 V. the change on each plate of capacitor is

physics-General

Charge on each plate of each capacitor

physics-

#### For the circuit shown in figure the charge on 4F capacitor is

Combined capacity of and = 1 + 5=

Now, and are in series.

Charge in the arm containing capacitor is

Now, and are in series.

Charge in the arm containing capacitor is

#### For the circuit shown in figure the charge on 4F capacitor is

physics-General

Combined capacity of and = 1 + 5=

Now, and are in series.

Charge in the arm containing capacitor is

Now, and are in series.

Charge in the arm containing capacitor is

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#### Electrons ejected from the surface of a metal, when light of certain frequency is incident on it, are stopped fully by a retarding potential of 3 volts Photo electric effect in this metallic surface begins at a frequency 6 x 1014s ^{-1} The frequency of the incident light in s^{-1} is [h=6 x 10^{-34}J-sec;charge on the electron=1.6x10^{-19}C]

#### Electrons ejected from the surface of a metal, when light of certain frequency is incident on it, are stopped fully by a retarding potential of 3 volts Photo electric effect in this metallic surface begins at a frequency 6 x 1014s ^{-1} The frequency of the incident light in s^{-1} is [h=6 x 10^{-34}J-sec;charge on the electron=1.6x10^{-19}C]

physics-General

physics-

#### Trajectories of two projectiles are shown in figure. Let and be the time periods and and their speeds of projection. Then

Maximum height and time of flight depend on the vertical component of initial velocity

Here

Range

Here

Range

#### Trajectories of two projectiles are shown in figure. Let and be the time periods and and their speeds of projection. Then

physics-General

Maximum height and time of flight depend on the vertical component of initial velocity

Here

Range

Here

Range

physics-

#### A body is projected up a smooth inclined plane with a velocity from the point as shown in figure. The angle of inclination is and top of the plane is connected to a well of diameter 40 m. If the body just manages to cross the well, what is the value of ? Length of the inclined plane is , and

Let be the velocity acquired by the body at which will be moving making an angle with the horizontal direction. As the body just crosses the well so

or

or

Taking motion of the body from to along the inclined plane we have

As

or or

or

or

Taking motion of the body from to along the inclined plane we have

As

or or

#### A body is projected up a smooth inclined plane with a velocity from the point as shown in figure. The angle of inclination is and top of the plane is connected to a well of diameter 40 m. If the body just manages to cross the well, what is the value of ? Length of the inclined plane is , and

physics-General

Let be the velocity acquired by the body at which will be moving making an angle with the horizontal direction. As the body just crosses the well so

or

or

Taking motion of the body from to along the inclined plane we have

As

or or

or

or

Taking motion of the body from to along the inclined plane we have

As

or or

Maths-

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#### The equation of the circumcircle of the triangle formed by the lines and y=0 is

Maths-General

physics-

#### Which of the substance or has the highest specific heat? The temperature time graph is shown

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If we draw a line parallel to the time axis then it cuts the given graphs at three different points. Corresponding points on the times axis shows that

If we draw a line parallel to the time axis then it cuts the given graphs at three different points. Corresponding points on the times axis shows that

#### Which of the substance or has the highest specific heat? The temperature time graph is shown

physics-General

Substances having more specific heat take longer time to get heated to a higher temperature and longer time to get cooled.

If we draw a line parallel to the time axis then it cuts the given graphs at three different points. Corresponding points on the times axis shows that

If we draw a line parallel to the time axis then it cuts the given graphs at three different points. Corresponding points on the times axis shows that