1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Snowcat [4.5K]
3 years ago
5

Which colors will eject electrons when they strike sodium, which has a frequency threshold of 5.7 × 1014 Hz?

Physics
2 answers:
Harlamova29_29 [7]3 years ago
8 0

Answer: Violet and Blue color

Explanation:

From photoelectric effect, we understand that when a radiation of frequency equal or greater than threshold frequency of metal falls on it, electrons are ejected. Thus, the color which will eject electrons when they strike sodium which has a threshold frequency of 5.7 × 10¹⁴ Hz should have greater frequency than its.

The frequency of Blue color is 6.6× 10¹⁴ Hz  and violet is 7.3 × 10¹⁴ Hz . Thus, these two colors would be able to eject electrons from Sodium. Rest of the colors have lower frequency than threshold.

sineoko [7]3 years ago
6 0
Violet and green colour
You might be interested in
Consider a space shuttle which has a mass of about 1.0 x 105 kg and circles the Earth at an altitude of about 200.0 km. Calculat
kodGreya [7K]

Answer:

1.6675×10^-16N

Explanation:

The force of gravity that the space shuttle experiences is expressed as;

g = GM/r²

G is the gravitational constant

M is the mass = 1.0 x 10^5 kg

r is the altitude = 200km = 200,000m

Substitute into the formula

g = 6.67×10^-11 × 1.0×10^5/(2×10^5)²

g = 6.67×10^-6/4×10^10

g = 1.6675×10^{-6-10}

g = 1.6675×10^-16N

Hence the force of gravity experienced by the shuttle is 1.6675×10^-16N

7 0
3 years ago
Information about climate change?​
Kamila [148]
The term climate change encompasses global warming, but refers to the broader range of changes that are happening to our planet. , These broader climate changes include: rising sea levels, shrinking mountain glaciers, accelerating ice melt in Greenland, Antarctica and the Arctic, and shifts in flower and plant blooming times.
5 0
3 years ago
When a skydiver jumps out of a plane in free fall, they hit a
IRISSAK [1]

Answer:

By decreasing the surface area exposed to the air. Vertical body position instead of horizontal.

Explanation:

So the terminal velocity formula is as follows.

v = sqrt[(2*m*g)/(p*A*c)]

m = mass

g = 9.81 m/s^2

p = density of air

A = surface area of object

c = Drag coefficient

So the only thing you can change in mid-air is surface area.

5 0
3 years ago
A student releases a ball from a height of 100 cm above the ground. It bounces to a height of 80 cm. Answer the following questi
Zepler [3.9K]

if α = 90°, then the formula simplifies to: hmax = h + V₀² / (2 * g) and the time of flight is the longest. ...

if α = 45°, then the equation may be written as: ...

if α = 0°, then vertical velocity is equal to 0 (Vy = 0), and that's the case of horizontal projectile motion.

4 0
3 years ago
Why unit of pascal is called derived unit?​
Annette [7]

Answer:

This is because it is derived from newtons and metres as shown in the expression;

Explanation:

pressure =  \frac{force}{area} \\  P= \frac{F}{A}  \\ P= \frac{newtons}{ {m}^{2} }  \\  = pascals

5 0
3 years ago
Read 2 more answers
Other questions:
  • The chart shows data for a moving object.
    7·2 answers
  • I’m having trouble with this
    5·1 answer
  • I'm having trouble understanding the equation for average speed. Can someone please explain to me because I have a test tomorrow
    8·1 answer
  • A solid conducting sphere of radius 2.00 cm has a charge of 6.88 μC. A conducting spherical shell of inner radius 4.00 cm and ou
    13·1 answer
  • 8 Explain How can subsidence lead to the formation of sedimentary rock
    7·1 answer
  • Air pressure in a tire is maintained because the air molecules are
    12·1 answer
  • Hi! I just need the equation for how to solve it, then plug the numbers into it, and then the answer for both problems. Thanks!
    13·1 answer
  • A body of mass m1 = 1.5 kg moving along a directed axis in the positive sense with a velocity
    7·1 answer
  • Two football players collide head-on in midair while chasing a pass. The first player has a 110 kg mass and an initial velocity
    9·1 answer
  • (b)
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!