We know, $T=2\pi\sqrt{\dfrac{m}{k}}$

So, $T_n=2\pi\sqrt{\dfrac{2m}{4k}}=\dfrac{1}{\sqrt2}2\pi\sqrt{\dfrac{m}{k}}$

$\therefore \dfrac{f_n}{f}=\dfrac{T}{T_n}=$$\sqrt2$

## Search found 38 matches

- Fri Feb 01, 2019 8:55 pm
- Forum: Physics
- Topic: BdPhO Regional (Dhaka-South) Secondary 2019/3
- Replies:
**1** - Views:
**686**

- Fri Feb 01, 2019 6:52 pm
- Forum: Physics
- Topic: BdPhO Regional (Dhaka-South) Secondary 2019/2
- Replies:
**1** - Views:
**748**

### Re: BdPhO Regional (Dhaka-South) Secondary 2019/2

Here, time $ =(50-30) s = 20 s$

So, Heat $=(50*20) = 1000 J$

So, the specific latent heat of the fusion $= \dfrac{1000}{4}=\boxed {250}$ $Jkg^{-1}$

So, Heat $=(50*20) = 1000 J$

So, the specific latent heat of the fusion $= \dfrac{1000}{4}=\boxed {250}$ $Jkg^{-1}$

- Tue Jan 29, 2019 4:35 pm
- Forum: Physics
- Topic: BdPhO Regional (Dhaka-South) : Problemsets
- Replies:
**0** - Views:
**1370**

### BdPhO Regional (Dhaka-South) : Problemsets

$***BdPhO$ $Regional$ $(Dhaka-South)$ $:$ $Secondary***$ $Problem-1$ What will be the reading on the voltmeter? (See the figure) $Problem-2$ A solid object of mass $4 kg$ is heated at a constant rate $50 W$. The object is kept inside a thermally isolated container so that it cannot radiate heat to ...

- Tue Jan 29, 2019 9:26 am
- Forum: Secondary Level
- Topic: BDMO PREPARATION : Higher Math Problem (Binomial Expansion)
- Replies:
**1** - Views:
**2497**

### BDMO PREPARATION : Higher Math Problem (Binomial Expansion)

Which is greater $99^{50}+100^{50}$ or, $101^{50}?$

- Mon Jan 28, 2019 10:07 pm
- Forum: Physics
- Topic: BdPhO Regional (Dhaka-South) Secondary 2019/8
- Replies:
**0** - Views:
**1504**

### BdPhO Regional (Dhaka-South) Secondary 2019/8

BdPhO Regional (Dhaka-South) Secondary 2019(8).png Consider two spheres with charge density $+ρ$ and $-ρ$ respectively. The radius of both the spheres is $R$. The centers of the two spheres are at distance $d$ from each other (Here $d<2R$). There is no charge in the intersecting region. Consider a ...

- Mon Jan 28, 2019 9:53 pm
- Forum: Physics
- Topic: BdPhO Regional (Dhaka-South) Secondary 2019/7
- Replies:
**1** - Views:
**8312**

### BdPhO Regional (Dhaka-South) Secondary 2019/7

BdPhO Regional (Dhaka-South) Secondary 2019(7).png Adventurous Azmain slides down a water slide. He starts with zero initial velocity. The initial point $A$ is at a height $H$ from the ground and the other end $B$ is at a height $h$. The tangent line to the water slide at the point $B$ makes an ang...

- Mon Jan 28, 2019 9:17 pm
- Forum: Physics
- Topic: BdPhO Regional (Dhaka-South) Secondary 2019/6
- Replies:
**1** - Views:
**8316**

### BdPhO Regional (Dhaka-South) Secondary 2019/6

BdPhO Regional (Dhaka-South) Secondary 2019(6).png A light ray is incident on a rectangular slab $ABCD$ at an angle $θ$ with the normal. The refractive index varies with vertical distance $y$ in the rectangular slab. Refractive index, $n(y) = ky$, for $0 < y < h$, where $k$ is a constant. At what a...

- Mon Jan 28, 2019 4:28 pm
- Forum: Physics
- Topic: BdPhO Regional (Dhaka-South) Secondary 2019/5
- Replies:
**0** - Views:
**1478**

### BdPhO Regional (Dhaka-South) Secondary 2019/5

A boy is holding a ball in his hand in a train moving with constant velocity $v$. Then he releases the ball from height $H$ above the floor of the train. What trajectory will the boy see? If the train moved in a constant acceleration, $a$ what would be the trajectory with respect to the boy? How far...

- Mon Jan 28, 2019 4:16 pm
- Forum: Physics
- Topic: BdPhO Regional (Dhaka-South) Secondary 2019/4
- Replies:
**1** - Views:
**8226**

### BdPhO Regional (Dhaka-South) Secondary 2019/4

Consider an isolated system consisted of a ball, and a bucket of water. The ball is released from height, $H$ above a bucket of water. The initial temperature of the water-bucket system and the ball are $T_1$ and $T_2$ respectively. What will be the final temperature of the water after the ball is d...

- Mon Jan 28, 2019 4:11 pm
- Forum: Test Forum
- Topic: বাংলায় লেখা
- Replies:
**0** - Views:
**8405**

### বাংলায় লেখা

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