3 years ago

The wavelength of sound wave is 30 m. Frequency is 7 Hz. What is the wave speed

Physics

1 answer:

MaRussiya [10]3 years ago

6 0

Answer:23hz

Explanation:

You might be interested in

A box experiencing a gravitational force of 600 N is being pulled to the right with force of 250 N. A 25 N frictional force acts

bearhunter [10]

Answer: 0 NEWTONS

Explanation:

6 0

2 years ago

What is the current in a 160V circuit if the resistance is 2Ω? V= I= R=

Alex787 [66]

Explanation:

v = IR

v= 160 R = 2

160 = 2I

2 2

I = 80A

4 0

2 years ago

An electron emitted in the beta decay of bismuth-210 has a mean kinetic energy of 390 keV. (a) Find the de Broglie wavelength of

Sauron [17]

Explanation:

Given that,

The mean kinetic energy of the emitted electron, $E=390\ keV=390\times 10^3\ eV$

(a) The relation between the kinetic energy and the De Broglie wavelength is given by :

$\lambda=\dfrac{h}{\sqrt{2meE}}$

$\lambda=\dfrac{6.63\times 10^{-34}}{\sqrt{2\times 9.1\times 10^{-31}\times 1.6\times 10^{-19}\times 390\times 10^3}}$

$\lambda=1.96\times 10^{-12}\ m$

(b) According to Bragg's law,

$n\lambda=2d\ sin\theta$

n = 1

For nickel, $d=0.092\times 10^{-9}\ m$

$\theta=sin^{-1}(\dfrac{\lambda}{2d})$

$\theta=sin^{-1}(\dfrac{1.96\times 10^{-12}}{2\times 0.092\times 10^{-9}})$

$\theta=0.010^{\circ}$

As the angle made is very small, so such an electron is not useful in a Davisson-Germer type scattering experiment.

4 0

3 years ago

two cars are traveling in opposite directions on the thruway. car a is traveling at 55mi/h and car b is traveling at 70 mi/h the

Tresset [83]

a minute or less than a minute

3 0

2 years ago

What could serve as ballast for a balloon? Help pls...thx

I am Lyosha [343]

With the advent of the plastic balloon and the beginning of the unmanned ... That would lead to a more sophisticated ballast system that uses fine steel or iron

6 0

3 years ago