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A plane mirtor is approaching a boy at 5 {~m} / {s}. The speed

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A plane mirtor is approaching a boy at $5 m / s$ . The speed of image of boy with respect to boy is equal to

$\frac{5}{2} m / s$
Zero
$5 m / s$
$10 m / s$

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Question 1

Hard

A sample of radioactive material has an alpha emitter

(X)

and a beta emitter

(D)

. The energy of decay reactions are

Q_{1}

and

Q_{2}

respectively.

_{Z}^{A} X \to_{Z - 2}^{A - 4} Y +_{2}^{4} He + Q_{1}_{Z^{'}}^{A^{'}} D \to_{Z^{'} + 1}^{A^{'}} B +_{- 1}^{0} e + \overset{v}{ˉ} + Q_{2}

The radiation coming out from the sample is passed through two parallel slits

S_{1}

and

S_{2}

to get a narrow parallel beam of alpha and beta particles. This beam is allowed to enter perpendicularly into a region of uniform magnetic field. The particles after taking a semicircular path strike the screen at point

a

above the line

L

and, below the line

L

particles are found to strike the screen everywhere from

O

b

. The distance

O a

and

O b

and

r_{1}

and

r_{2}

respectively. Find the ratio

\frac{r _{1}}{r _{2}}

. Take

\frac{Q _{1}}{Q _{2}} = k

and assume that mass of alpha particle is 4 time the mass of a proton which is

η

times the mass of an electron.

Topic:

Nuclei

Book:

Problems in Physics II for IIT JEE (McGraw Hill)

View solution

Question 2

Medium

Two electric dipoles of moment

P

and

64 P

are placed in opposite direction on a line at a distance of

25 cm

.
The electric field will be zero at point between the dipoles whose distance from the dipole of moment

P

$5 cm$
$\frac{25}{9} cm$
$10 cm$
$\frac{4}{13} cm$

Topic:

Electric Charges and Fields

View 12 solutions

Question 3

Medium

In a potentiometer experiment, a wire of length 10

m

having resistance

2 Ω / m

is connected with a cell of

5 V, 1Ω

and an unknown resistor

R

. If potential gradient of wire is

2 mV / cm

, then value of

R

is (1)

30Ω

(2)

3Ω

(3)

29Ω

(4)

50Ω

Topic:

Current Electricity

View 5 solutions

Question 4

Medium

In a hydrogen atom, the electron is in nth excited state. It may come down to second excited state by emitting ten different wavelengths. What is the value of

n

Topic:

Atoms

View 5 solutions

Students who ask this question also asked

Question 1

Answer Total cross femurs is

A = 2 \times 10 m^{2} = 20 \times kg wt = 400 N

force acting on

(m s^{- 2}

). This force is acting vertically down and hence, normally on the directions in a femurs. Thus, the average pressure is that like other t

P_{a v} = \frac{F}{A} = 2 \times 1 0^{5} N m^{- 2}

10.2.1 Pascal's Law The French scientist Blaise Pascal observed that

Now conside the pressure in a fluid at rest is the same at all horizontal bar points if they are at the same height. This fact is in equilibriu may be demonstrated in a simple way. at its two en Fig. 10.2 Proof of Pascal's law. ABC-DEF is an Consider a element of the interior of a fluid at rest. Fig.

10.3

poin This element is in the form of a right- The pressure angled prism. The element is small so that respectively. the effect of gravity can be ignored, but it fluid having a has been enlarged for the sake of clarity. fluid is at re Fig.

10.2

shows an element in the interior of should be zer a fluid at rest. This element

A BC - D EF

is in the should balan form of a right-angled prism. In principle, this forces acting prismatic element is very small so that every the fluid pi part of it can be considered at the same depth downward, a from the liquid surface and therefore, the effect If

m g

is weig of the gravity is the same at all these points. have But for clarity we have enlarged this element.

(P_{2} - P_{1}) A

The forces on this element are those exerted by

Now, if

ρ

i the rest of the fluid and they must be normal to have the ma the surfaces of the elenient as discussed above. that Thus, the fluid exerts pressures

P_{a}, P_{b}

and

P_{c}

P_{2} - P_{1} = ρ g

Topic:

Optics

View solution

Question 2

You are given two identical plano-convex lenses. When you place an object

20 cm

to the left of a single plano-convex lens, the image appears

40 cm

to the right of the lens. You then arrange the two plano-convex lenses back to back to form a double convex lens. If the object is

20 cm

to the left of this new lens, what is the approximate location of the image?

Topic:

Optics

View solution

Question 3

104 +2.17nglish (17apec - I) 1.ook ar wame other eaimples 1 More on Quantifiers. 1. much, many, a lot of, (a) litte, (a) few Much atd many are used in negatives and questions/inferrogatives generally Much is used before uncountable nouns and many with plural countables. A lot of and lots of can be used with countables and uncountables in positis (remarks) sentences. A litile and little can be used with uncountable nouns only. Few and a few can be used with plural countables. Activity - 7 Use much, mdny, a lot of, lots of in the blank spaces, where required in sentences below. (In some blank spaces more than one alternative is possible

I can't come with you. I've got work to do,
He's not got $⟶$ money, so he can't buy that house,
He is very quiet person. He doesn't speak
I'm hoping to get a ticket for the match. But there aren't _ seats left, I
That car is very old. It uses petrol.
I haven't got time for watching sport at the moment.
- people come to the public meeting addressed by the Chief Minister.

Topic:

Optics

View solution

Question 4

a) Ray diagram for the formation of image. b) Derive the formula for magnifying power, when the image is formed. i) at least distance of distinct vision ii) at infinity अथवा

Or

Topic:

Optics

View 2 solutions

Question Text	A plane mirtor is approaching a boy at $5 m / s$ . The speed of image of boy with respect to boy is equal to
Topic	Optics
Subject	Physics
Class	Class 12

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A plane mirtor is approaching a boy at 5 m/s. The speed of image of boy with respect to boy is equal to

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A plane mirtor is approaching a boy at $5 m / s$ . The speed of image of boy with respect to boy is equal to